The evolution of polar bears
Theory
The polar bears will be bigger in two thousand years to survive the heat. Global warming has already been linked to an increase in flooding, extreme heat waves, and other extreme weather events. The climate is changing because systems on and beyond the earth are changing. The earth has always experienced changes in climate, but they have occurred as a consequence of natural changes like changes in the axis, or in the earths orbit around the sun, and varations in solar radiation. Natural changes are still taking place.
The polar bears will be bigger in two thousand years to survive the heat. Global warming has already been linked to an increase in flooding, extreme heat waves, and other extreme weather events. The climate is changing because systems on and beyond the earth are changing. The earth has always experienced changes in climate, but they have occurred as a consequence of natural changes like changes in the axis, or in the earths orbit around the sun, and varations in solar radiation. Natural changes are still taking place.
This is a picture of the ice breaking and the polar bears with the hearts where separated. Millions of years later the ice reformed and the polar bears had to adapt to there environment so they changed. Now the heart polar bears can NOT reproduce because they have changed to adapt to their environment.