One of the biggest concerns about global warming is that higher temperatures could affect food production in many parts of the world.
Many crops need certain temperature ranges to grow properly.
Food shortages and famine could result.
Also, if warmer temperatures cause polar ice to melt, sea levels could rise and lead to flooding in coastal areas.
The warmest 10 years of the twentieth century all happened between 1985 and 2000.
Global dimming, which is a result of increasing concentrations of atmospheric aerosols that block sunlight from reaching the surface, has partly countered the effects of greenhouse gas induced global warming.
