Because for truly reliable information on a subject matter as
extensively researched as earth's climate, what you should be
looking for are statements of large and independent scientific
organizations of good reputation. In the case of climate change,
that would be national or international bodies of geologists,
climatologists, biologists, geophysical unions, stuff like that.
Once you check out what they have to say, you will find out that
there really isn't much of a debate: An increasing body of
observations gives a collective picture of a warming world and
other changes in the climate system [...] There is new and
stronger evidence that most of the warming observed over the
last 50 years is attributable to human activities. - Climate
Change 2001: Working Group I: The Scientific Basis, IPCC,
January 2001. That is just one of the many statements of
prominent organizations. Even those statements should be checked
against others of equal standing: That is the level on which we
determine whether there is a cons