I will be polite and attempt to answer your questions above.
1. As noted earlier over 300 scientists have come out stating their papers are mis-classified - most have multiple papers. You are welcome to go through the many articles on google and create an entire list. After you have done so - please feel free to post the entire list of scientists to this forum. Each article outlines a few dissenting scientists - there are many of them out there. You wanted a number - the number is currently at 300 and increasing.
2. The actual surveys (many of them posted in these forums) in recent years show a consensus on AGW among scientists of a mere 53% and dropping each year. Why do politicians and advocates only quote the fabricated "97% Consensus" figure which is solely supported by only two items - by the Doran survey (77 out of 79 scientists - when pruned down from over 3000 responders), and the Cook evaluation of scientific papers which fails on many levels. Why are the many other surveys on global warming ignored? Well let me answer, it does not support their politics.
3. The reason to fight against AGW is because it undermines the integrity of science for political purposes and drives failed public policy which misspends money. "Climate Change" is a $1.5 Trillion per year industry built around a problem that does not exist. A far greater danger to mankind is natural global cooling (which is around the corner). There are many obvious environmental issues where "green" money could be better spent such as pollution, hard-particle pollution from smokestacks (not CO2), coastal fisheries, limiting development in ecologically critical areas, and preservation of natural lands via parks, etc.
Sadly many of the "green" initiatives I support including solar, wind, micro-grid, back-metering, electric cars, smoke-stack scrubbers, and preserving rivers/coastal areas are undermined by AGW - causing the real problems not be focused on. Imagine if the $1.5 Trillion per year were used to address these problems plus the issues facing people such food, clean water, shelter, and medical care world-wide.
"Climate Change" is merely a money-making grab for hedge funds (Al Gore's GIM as an example), consulting firms, and government grant receivers - all of them driving flawed science to support the money in their pocket.
Around 2040 or so - AGW will be viewed as the largest scientific fraud of the previous century.