GEOLOGY

Detailed explanation-1: -Carbon dioxide now more than 50% higher than pre-industrial levels | National Oceanic and Atmospheric Administration.

Detailed explanation-2: -The amount of CO₂ in the atmosphere has increased more than 20% in less than 42 years, owing largely to human activities, and representing well over 50% of the total increase in atmospheric carbon dioxide since the onset of the industrial revolution (1750).

Detailed explanation-3: -Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy. Fossil fuels like coal and oil contain carbon that plants pulled out of the atmosphere through photosynthesis over many millions of years; we are returning that carbon to the atmosphere in just a few hundred.

Detailed explanation-4: -When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, causing global warming. Already the average global temperature has increased by 1C.