Trump is pushing coal and pushing against alterenatives to coal. So he is part of the problem. The scientist are finding out that the ice is melting faster than predicted and it may already be too late to change this. Once the ice is gone it will be hard to turn things around. The ice at the poles reflects a lot of the sunlight. But without the ice the darker areas under the ice absorbs more heat and that is a big problem.
We are already seeing the effects of a warmer climate.