Question

How is burning of fossil fuels thought to be related to globe warming . Plzz do answer in short!

Answer 1

Because it releases a lot of harmful greenhouse gases which is the one of the main cause of global warming . That's why it is related to global warming .
As you wanted in short....

Answer 2

when there is exessive use of fossil fuels then pollution increses and also scarcity of it makes us to dig deeper and deeper then temp.increases,when it spilts /spteads in water bodies it makes acid rains this damages trees then global warming...