'Calm down' was not the advice of Columbia professor, climatologist James Hansen, back in 1988, 36 years ago, when he was invited to testify before the US Senate Committee on Energy and Natural Resources. It's now 36 years later.
Anybody without similar qualifications -- and the dozens of methods he recommended that could be used to avoid disaster -- has no standing to advise us to calm down. Yes, there are people out there with -some- decent science credentials still denying it. Yet the greenhouse effect, understandable to grade-schoolers, was first suspected in 1824 by physicist Fourier and long confirmed.