One is Aurelien Barrau, astrophysicist and philosopher, who made me realize that CO2 is not the problem. If we changed fossil fuels with fusion, we would still be living a mass extinction. We are destroying biodiversity because of our way of life.
The other one is Jean-Marc Jancovici, who explains that the root cause is fossil fuels. Climate is just a consequence (a very bad one, hence we need to solve the energy problem even faster).
I strongly recommend his book, which explains his ideas really well. Probably works better if you know Europe a bit, but I think that the English edition is modified a bit for US citizen: https://www.amazon.com/World-Without-End-Blain-Christophe-eb...