Greenhouse gas emissions in the United Kingdom 1990 -2020, by sector

In 2020, the primary source of greenhouse gas emissions in the United Kingdom was the transportation sector. That year, transportation released almost 100 million metric tons of carbon dioxide equivalent into the atmosphere. This was followed by the energy supply sector, which emitted 84 MtCO2e. The energy supply sector was once the largest contributor to UK emissions, but a shift away from coal-fired power and a transition to renewable energy sources has seen emissions within the sector reduce by roughly 70 percent since 1990. This has contributed greatly to the UK's annual GHG emissions halving compared with 1990 levels.