In general the largest craters on the Moon and Mercury tend to be considerably larger than those found on Earth. Why

Due to lack of water and atmosphere.

Explanation:

The largest craters on the Moon and Mercury are larger than those found on Earth because craters dominate the surfaces of Mercury and the Earth's Moon due to absence of water. Both moon and mercury lack liquid water on their surfaces that would remove the impact of craters with the passage of time. They also absence of an atmosphere on planets like the Earth and Venus, that could disintegrate meteoroids before they comes in contact to the surface.

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.