Global Warming. Is it real, is it a threat, and who's to
blame?
There are three issues here.
Is the Earth warming abnormally now, or is this current trend
normal?
If the Earth is warming abnormally, is this a problem?
If the Earth is warming abnormally, can we attribute this to an
overactive Sun, or to human activities.
This is a politically-charged issue. There is plenty of data,
but the data can be interpreted in more than one way. The...