The Bear on Ice photo represents the ide of global warming.
Some people deny it, yet the evidence is very strong.
Recent changes in weather patterns are a result of climate change due to changes in the natural environment.
Here is a chart showing:
World Population Growth
See a full size image here. Click Here.
From the chart you can see that in about 200 years the world population has gone from about one billion to eight billion humans on the one planet. That has made a big change in the world environment. Especially when you consider that we humans tend to use a lot of the resources of this earth.