In 2017, Estonia's total greenhouse gas (GHG) emissions were as follows 20,9 million tonnes(20 879,9 kt) of carbon dioxide equivalent (CO2 eq).
Energy sector is the largest source of greenhouse gases in Estonia. In 2017, 88.8% of Estonia's greenhouse gas emissions came from the energy sector. Source: https://www.envir.ee/et/eesmargid-tegevused/kliima/rahvusvaheline-aruandlus/kui-palju-eestis-kasvuhoonegaase-tekib
This makes Estonia one of the highest CO2 emitters per capita in the world. Source: https://databank.worldbank.org/reports.aspx?source=2&series=EN.ATM.CO2E.PC&country=#
In line with the "Climate Policy Guidelines 2050" agreed by the Riigikogu in 2017, Estonia's long-term target is to reduce greenhouse gas emissions by nearly 80 percent by 2050 compared to 1990 levels. In absolute terms, this means a maximum reduction of 8 million tonnes of CO2 emissions from 2017 emissions of 22 million tonnes.
To achieve this objective: "Estonia will be an attractive environment for the development of innovative technologies, products and services, in particular those that reduce greenhouse gas emissions.
It will also encourage their export and global application to address global climate change challenges. And "8. Industrial processes will promote the use of predominantly low-carbon technologies and the efficient use of resources."
See also the Ministry of the Environment's "Climate Policy Guidelines 2050", which you can find here.