Answer:
The earlier existing organisms including both flora and fauna, that were buried millions of years back, were converted into fossils and these fossil fuels are some of its forms.
The use of fossil fuels has extensively increased over the last few decades. This increasing consumption of fossil fuels has a negative effect as it releases a large amount of carbon into the atmosphere.
The cutting of trees also affects the atmosphere, because in the absence of trees, the CO₂ will not be absorbed by the plants and there will be less amount of O₂ as well. This will lead to an increasing amount of carbon into the atmosphere.
This carbon content when increases in its amount and rapid deforestation can lead to the following consequences-