This is such a scary sentence! The problem of climate change has been cause precisely by a lack of democracy. The military, the large oil refiners, the design of our infrastructure has been deeply affected by corporate priorities at the expense of a manipulated populace. We have climate denial in the US in large part because of corporate propaganda (and the fact that if people's oil sector jobs disappear there's no organized democratic approach to help them, they're at the mercy of the private sector).
Furthermore, real democracy would include all the people affected by climate change that didn't cause it! The people of the Marshal islands should certainly have a say in how we approach this problem. Saying we don't need democracy is an extremely America centric approach.
In the circles I'm in, we talk a lot about eco-facsism, which is the way the ecological crisis will be used to promote fascist policies with a green tinge. These include blaming immigrants, cracking down on poor people, and denying democracy in favor of the technocratic actors who caused the problem in the first place.
We need the opposite! We need complete renewal of democracy and democratic practice in order to solve these problems. This idea scares the powerful because solving this crisis necessarily requires democratic control of major parts of the economy, which is a threat to the existing beneficiaries of the economic system.