Taking Action to Lower Emissions STUDY OF GREENHOUSE GAS EMISSIONS 20 212021 Study of Greenhouse Gas Emissions “As a responsible energy producer our goal is to create the most value with the least environmental impact possible. We do this by maintaining operational integrity across all our infrastructure, designing our processes to maximize efficiency and meet rigorous international standards. Finding ways to reduce our greenhouse gas emissions remains a priority for the company and since 2019, we’ve reduced our overall emissions by 55%.” – GARY GUIDRY, PRESIDENT AND CEO Study Methodology The only prevalent GHGs emitted from oil and natural gas industry operations are carbon dioxide (CO 2 ), methane (CH 4 ) and nitrous oxide (N 2 O). Collecting this data is important because many scientists believe these gases contribute to global climate change. This information will allow GTE, its local and global stakeholders and the public to assess the Company’s emission reduction efforts over time. The assessment was conducted according to guidelines and standards adopted by the following organizations: International Petroleum Industry Environmental Conservation Association (IPIECA), International Association of Oil and Gas Producers (IOGP), American Petroleum Industry (API), U.S. Environmental Protection Agency (EPA), Canadian Association of Petroleum Producers (CAPP) and Intergovernmental Panel on Climate Change (IPCC). Reporting Principles & Scope CAIA Ingeneiria prepared the report in adherence with the following principles of the IPIECA: § Relevance § Completeness GTE’s 2021 reporting boundary encompasses all of Gran Tierra’s operations, which were all located in Colombia during the year assessed: § The Putumayo process facilities, well pads and camps § The Middle Magdalena Valley process facilities, well pads and camps § The Bogotá Office Reporting Period The reporting period is defined as January 1 st through December 31 st , 2021. Reporting and Understanding GHG Emissions: Gases have different heat absorption and retention capacities. The Global Warming Potential (GWP) is a relative measure of how much heat potential a greenhouse gas absorbs and retains in the atmosphere. The GWP is used to compare global warming impacts of various gases. The higher the GWP, the more energy the gas absorbs per unit weight, thereby having a greater global warming impact. The GWP is a coefficient and is multiplied by the unit weight of gas type. § Consistency § Transparency § Accuracy Gran Tierra Energy (GTE) has reported its Greenhouse Gas Emissions for the past six years retaining CAIA Ingenieria, a respected Colombian company with expertise in the field of air quality to create a voluntary assessment of its greenhouse gas (GHG) emissions. This assessment involved collecting, analyzing and quantifying 2021 air emissions data from GTE’s operations, while making recommendations for future reduction opportunities.GTE Emissions by Field (2021 Scope 1 & 2) Facility Total Emissions by field (tons CO 2 e) Carbon Intensity (kg CO 2 e/boe) Acordionero126,20922.98 Ayombero1,87733.71 Chuira54248.02 Cohembi38,47222.69 Colón4717.54 Costayaco48,32424.94 Cumplidor2,24827.21 Gaitero00 Guayuyaco1,79417.98 Juanambú2,76523.85 Juglar5,49681.68 Los Ángeles2,39112.28 Mary-Miraflor9421,911 Mono Araña4,70431.71 Moquetá5,9117.39 Nancy1,67322.30 Querubín451.72 Quillacinga15,385122.09 Quinde2,19520.61 Santa Lucía 3177.96 Toroyaco1,16046.54 Tronos1027.41 Vonu4,142243.29 Zoe01.07 GTE Emissions by Source (2021 Scope 1) Source Scope 1 emissions (metric tons of CO 2 e) % of Total Scope 1 GHG Emissions Fixed Combustion103,94250% Fugitive Emissions11,4596% Mobile Sources11,6655% Flaring75,06036% Venting6,5893% TOTAL208,714 GTE Emissions by Gas (2021 Scope 1) Greenhouse Gas Type Scope 1 emissions (metric tons of CO 2 e) % of Total Scope 1 GHG Emissions CO 2 184,47588% CH 4 23,89111% N 2 O3480.1% TOTAL208,714Recommendations In its assessment of Gran Tierra’s 2021 emissions, CAIA made the following recommendations to further improve GTE’s Greenhouse Gas emission performance: RECOMMENDATION: Consider the direct measurement of fugitive emissions and vents. GTE ACTION: As part of its commitment to drive down GHG emissions where feasible, GTE has contracted external experts to begin in-person measurements of potential fugitive emission sources at its three main producing facilities. It is expected that this verification will be completed in early 2023. The additional understanding gained on fugitive emissions is being undertaken to help refine our GHG quantification and disclosures, and will allow the Company to focus reduction efforts where they will have the biggest impact. RECOMMENDATION: Establish real-time tracking and internal reporting of GHG activity levels throughout the year. GTE ACTION: GTE is undertaking real-time tracking and internal reporting approaches as a way to integrate GHG data into its ongoing Environmental Information Management systems. By tracking and internally reporting estimated GHG emissions on a regular basis, GTE’s management will be able to actively monitor GHG impacts on a project-by-project basis. RECOMMENDATION: Contribute to meeting the Government of Colombia’s GHG emission reduction targets. GTE ACTION: GTE is actively engaged in aligning its corporate GHG reduction actions with the Government of Colombia’s plan to meet its emissions reduction targets and GTE participates in meetings with Colombia’s Ministry of Mines and Energy on an ongoing basis. Additionally, GTE is building an inventory of GHG emission reduction opportunities in order to assess potential mitigation actions and to prioritize measures that will be considered in the coming years. Scope 1 & 2 Emissions Flaring Emissions Global Carbon Intensity % Energy From Municipal Grid 55% DECREASE 81% 46%40% DECREASE DECREASEDECREASE (Between 2019-2021) Calculated using NTC ISO 14064-1 methodologyEmissions Reduction Actions GTE has successfully converted major production facilities to Gas-to-Power at Acordionero and Costayaco to run on gas produced in its fields, as well as smaller fields including Cohembi, Los Angeles, Mono Araña and Vonu. Gas-to- Power uses excess gas produced from GTE’s fields and instead of flaring it, converts it into power for use at our operations. This reduces the associated GHG emissions and the demand on National power grids. Gas-To-Power In 2021, Gran Tierra’s largest producing asset the Acordionero field, continued to produce more environmentally sustainable energy through the use of energy generated through Gas-to-Power. Gas sourced from Acordionero is also used to power other fields’ facilities, which results in a decrease in diesel consumption and a decrease in flaring. Nature-Based Solutions Gran Tierra also undertakes sustainability projects that aid in carbon sequestration. Carbon sequestration describes the process of capturing and storing atmospheric CO 2 . Through photosynthesis, forests and vegetation sequester carbon by capturing carbon dioxide from the atmosphere and converting it into organic matter used as a fuel source. Conclusions Gran Tierra’s 2021 GHG emissions results show that with a significant increase in production during the year, there was only a marginal increase in CO 2 equivalent emitted. In fact, emissions reduction efforts during this period resulted in an 11% decrease of emissions per barrel of oil from 2020 to 2021. Furthermore, compared to the Company’s 2019 baseline year, 2021 represented a significant reduction in emissions of 59%, where the Company saw its tonnes of CO 2 equivalent (CO 2 e) drop from 690,748 to 299,261. Gran Tierra’s emissions reduction strategy focuses on three key areas: First through consistent, transparent, and expanded reporting, secondly through Gas-to-Power projects and lastly, through nature-based solutions. The Company continues to look for ways to reduce the carbon intensity of its operations, while growing its production in response to increasing demand for energy products. “Gran Tierra continues to take actions to lower Greenhouse Gas emissions by utilizing excess natural gas from our operations to generate power instead of flaring it. Gran Tierra’s major capital investments in “Gas-to-Power projects” continue to be an important part of our efforts in reducing flaring. Gran Tierra has also created nature-based projects, like the Costayaco Forestry Centre and NaturAmazonas, which absorb and sequester significant volumes of carbon dioxide.” – DIEGO PEREZ-CLARAMUNT VICE PRESIDENT, HEALTH, SAFETY AND ENVIRONMENT & CORPORATE SOCIAL RESPONSIBILITYCostayaco Forestry Centre: An Expanding Reforestation Initiative Established by Gran Tierra Energy in 2010, in coordination with the regional environmental regulator Corpoamazonia, the Costayaco Forestry Centre (CFC) started with the purchase of a small piece of land for reforestation. The CFC now contains 314.5 hectares of new and maturing forested areas, contributing to an important corridor that connects the Amazon rainforest to the nearby Andes Piedmont areas. These two ecosystems are some of the most biodiverse in the world. Since the opening of the CFC in 2010, over 250,000 trees in 71 different species have been planted, sustainably contributing to GTE’s ongoing reforestation efforts in the region. Careful management ensures that the once-delivate saplings grow into sturdy, mature trees. Gran Tierra’s efforts to lower emissions through nature-based projects is a top priority for the Company, and GTE will continue to work Beyond Compliance, supporting environmental projects focused on reforestation, conservation and carbon sequestration. The Company continues to look for ways to reduce the carbon intensity of its operations, while growing its production in response to increasing demand for energy products. THE CENTRE SPANS ACROSS 314.5 HECTARES OF LAND, CONNECTING IMPORTANT BIODIVERSITY CORRIDORS DONATED OVER 22,000 SEEDLINGS AND TREES TO SCHOOLS AND COMMUNITIES IN THE PAST 3 YEARS +22k PLANTED OVER 250,000 TREES ACROSS THE PUTUMAYO AND CAUCA DEPARTMENTS 314.5 +250kGTE’s NaturAmazonas Project: Deforestation Reduction Actions NaturAmazonas is GTE’s flagship voluntary environmental program in partnership with the non-profit organization, Conservation International. This program aims to accelerate reforestation efforts by combating deforestation in Colombia’s Amazonia region, where the Amazon rainforest connects with the foothills of the Andes Mountain range. This region is home to one of the most sensitive and biodiverse ecosystems in the world. As part of the NaturAmazonas project, a network of agroforestry nurseries has been established to produce and cultivate native plants, improve sustainable infrastructure, and implement strategies to enhance the overall landscape. These nurseries are located within each of the Agroforestry Centres that have a joint capacity of growing 2.5 million seedlings per year. Many of the species cultivated are native to the Andean and Amazonian forests. The plants grown in these nurseries are planted in strategic locations around the regions neighbouring GTE’s operations or donated to communities and schools for reforestation purposes. So far, GTE has planted 993,087 trees through various reforestation activities carried out through the NaturAmazonas project. These reforestation efforts also make a significant contribution towards the 2030 emissions reduction and carbon sequestration targets established by the Colombian national government and the Ministry of Mines and Energy. NaturAmazonas has encouraged a cultural shift towards sustainability and fostered knowledge growth, conservation and technical training. The NaturAmazonas program reforested a total of 708 hectares of forest in Putumayo, Cauca and Caquetá Expected to sequester ~8.7 million tonnes of CO 2 through reforestation and conservation over the project’s lifetime THIS LARGE-SCALE SUSTAINABLE REFORESTATION INITIATIVE DELIVERS A VARIETY OF BENEFITS: Distribution of efficient stoves in rural areas that will improve air quality and reduce the release of carbon Strengthened relationships between institutions to establish a shared vision for reducing deforestation Education about sustainable use of resources that come from the forest Building a wealth of botanical knowledge about the flora in the sensitive Andes-Amazon piedmont region through the collection and analysis of over 10,000 plant specimens An emerging sustainable beekeeping and honey industry in the region Employment opportunities for hundreds of workers from the areaBACKGROUND ON GRAN TIERRA ENERGY Gran Tierra Energy Inc. is an independent international energy company focused on oil and natural gas exploration and production in Colombia and Ecuador. The Company’s common shares trade on the NYSE American, the London Stock Exchange and the Toronto Stock Exchange under the ticker symbol GTE. Gran Tierra believes that our activities and presence should coincide with a healthy environment and prosperous communities. CORPORATE HEADQUARTERS Gran Tierra Energy 500 Centre Street SE Calgary, Alberta, Canada T2G 1A6 Phone: 1 (403) 265 3221 www.grantierra.com/ESGNext >