Much of the sun’s radiation is reflected back into space by the earth’s rotation climate revolution atmosphere

Much of the sun's radiation is reflection back into space by the earth's atmosphere.

Hope this helps! :) -from peachimin

When the Sun radiation comes to the Earth, a part is absorbed and the other is reflected by the clouds in the atmosphere and the Earth’s surface.

This is called albedo, which is the percentage of radiation that any surface reflects with respect to the incident radiation. Clear surfaces have higher albedo values than dark ones, and bright ones more than matt ones. In this sense, Earth’s average albedo is about 0.3. In other words, about 30 percent of solar radiation that comes to the Earth is reflected back into space and 70 percent is absorbed.

Therefore:

a is the answer i believe.

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.