Loss of forests causes dual problems. Trees are burned up and release huge amount of carbon dioxide gas into the atmosphere. On the other hand, when forests are cleared, an important storehouse of carbon dioxide is destroyed. Thus, the lose of forests causes dual problems.

To control the increase of greenhouse gases we should stop cutting down trees and burning fossil fuels like coal. mineral oil, natural gas, etc.

Forests help us by absorbing a lot of carbon dioxide from the air and deliver oxygen in exchange. They help to bring about rain and prevent soil erosion.

Yes, man can influence the climate. By cutting down trees and burning fossil fuels human creates greenhouse effect which influences the climate.

Humans can neither change the sun's radiation nor the earth's orbit around the sun because it is beyond the ability of human being. We do not have the power or ability to change the radiation of sun or the orbit of earth.

Human activities such as burning fossil fuels, industrial activities and cutting down trees cause more carbon dioxide emission in the atmosphere. Thus, human beings are responsible for the increase in the greenhouse gases.