A well-funded right-wing organization perfected the argument that denialists use to discredit all the climate scientists that recognize global heating: they are all lying so that they can get paid to study the field.

They used it first in regard to tobacco, claiming that medical researchers lied claiming tobacco is dangerous, and their motive was to get more research grants.

There are plenty of areas for climate-related research, and if there were no global heating, they would look for other grants.

There are some corrupt scientists. They generally get corrupted by businesses, and you can find them arguing for the interests of some business or other.