Excessive combustion of fossil fuel leads to increase in oxygen in the atmosphere.
Large-scale deforestation leads to a decrease in the amount of gas A in the atmosphere whereas the amount of gas B increases. The increased amount of gas B in the atmosphere causes an effect C which leads to excessive heating of the earth and its atmosphere producing an undesirable phenomenon D. What are A, B, C and D?
Excessive combustion of fossil fuels leads to __________.