please can you explain to me the meaning of "physical environment doomed?

Answer 1

Political code words for "I got voted out of office!"

Answer 2

it's real simple.

As the earth warms, the ice melts. As the ice melts less light i reflected back into space, as open ocean absorbs light, and thus some heat from the sun.

As all of this happens the poles melt. 30% of cities were built on coastlines.

30, 40 years, many cities will be under, or have severe flooding by ocean water.

Years ago during the ice ages when the world was largely ice capped, ocean levels were much lower than they are now.

Period, end of story.

Do not buy beach property in Florida, it will be gone in 15 years.