For more than two centuries humans have been burning fossil fuels.
Today those fuels, especially oil, release billions of tons of
carbon dioxide, methane and other 'greenhouse gases' into our atmosphere.
Despite oil industry attempts to muddy the picture . . .
The evidence is indisputably clear -- human civilization
based on fossil fuels continues to heat up our atmosphere.
For details see:
The
EPA Global Warming site
Union of Concerned
Scientists
Global Warming site