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.