How much have major U.S. foundations spent to support global
warming/climate change advocacy?  This can be answered by a general
number for the past several years, or a narrower answer (i.e. "the top
10 foundations supporting efforts to stem global warming gave XX
dollars in 2002" or the most recent year information is available.

Greenpeace has spent considerable on global warming advocacy, but you
may not requard Greenpeace as a foundation? Some of the scientist
unions have spent some money, but they may not be foundations either.
My guess is traditional foundations have spent little, and it is
typically identified under a different heading. Most organizations
tend to be at least a little secretive.
 A significant number of scientists are embarased by the exagerations
of the global warming hype, as they are of the opinion that human
activities play a minor roll in the small amount of global warming
which has occurred and that new ice age could easily be the problem
before 2012.   Neil

Thanks for the comment, Neil.  It is true that many advocacy
organizations have spent considerably on global warming, although most
are funded by foundations to do that work.  The biggest foundations
that I know of doing this work are Pew, Packard, Rockefeller Brothers
and Rockefeller Family Fund.

"A significant number of scientists are embarased by the exagerations
of the global warming hype, as they are of the opinion that human
activities play a minor roll in the small amount of global warming
which has occurred."

This is completely false.  The MAJORITY of scientists and science
organizations (including the U.S. National Academy of Sciences) around
the world recognize the significance of human activity on global
warming.  The few scientists and organizations that claim otherwise
are almost entirely funded/supported by industries (such as the auto,
coal and oil industries) that have something to lose in the matter,
that is, money.  For instance, the auto industry does not want to
spend MONEY on making cars that are more enviromentally friendly
(i.e., that will make the air we breathe less dirty/toxic).  Thus, it
is in their best interest to argue that human activity has little
affect on global climate change.

Regarding your comment to Neil, I may be able to help you if you
clarify your question.  What do you mean when you ask "Is it true that
many advocacy organizations have spent considerably on global warming,
although most
are funded by foundations to do that work"?  Let me know...I may be
able to answer your question.  There are various foundations and
advocacy groups which support efforts (such as advocating for more
fuel-efficient vehicles and alternative fuel sources) to slow the pace
of global warming.  Obviously, the oil/gas industry (among others)is
not happy about such recommendations, for creating more fuel efficient
vehicles means people would need to buy less gas to  go farther
distances.  This means less money for corporations like Exxon, Mobil, 
BP, Citgo, etc.