According to the Edgar database, The UK produced 379.15 Megatonnes of CO2 in 2017.
At an average CO2 absorbtion of 48lbs per annum per tree, it would take approximately 17.4 billion trees to absorb The UK's annual CO2 emissions from fossil fuels.
= 1 billion trees
Per capita, each citizen of The UK produced an average of 5.7 tonnes of CO2 in 2017. It would take approximately 262 trees to absorb each individual's annual CO2 emissions from fossil fuels.
= 1 tree