According to the 2013 Fifth Assessment Report of the IPCC, the primary source of the increased atmospheric concentration of carbon dioxide since the pre-industrial period results from ___________________ _ use, with land-use change providing another significant but smaller contribution.
Fill in the blank with correct word.
Question 2
The____________________ provided by extra CO2 and other greenhouse gases has increased by about 3 W/m2 over the past several hundred years, with the most rapid increase occurring over the last several decades.
Fill in the blank with correct word.