As long as they base their 'evangelism' on facts and rationality I have no problem. It's just enthusiasm or zealousness or commitment by another name.
Let me personalise this.
I have two sons and three grandchildren. They live in a country (Australia) which is, and will continue be, significantly impacted by climate change. Last year for instance the entire east coast of the country was burning. With no global ameliorating action, temperatures will continue to rise. This is scientific fact. At what point will my grandkids be forced to leave their home to find escape from soaring temperatures and the associated extremes of fire and drought? Where will they go?
Next door to Australia, some of the low lying Pacific island countries are already beginning to see their shorelines retreat. Without action the Pacific Ocean will continue to rise as it warms and expands and as land based ice sheets in Antarctica and Greenland melt and pour into the oceans. Many of these islands could simply disappear. Where do they go?
Indonesia is close enough to Australia to touch. As a developing country with a population of 230,000,000 people where will they go as the temperature rises and the oceans flood low lying country? What happens when temperature and weather interrupt basic agriculture?
If this all sounds a bit melodramatic, cast your mind back to when Covid first hit the US. Predictions of 100,000, 200,000, 400,00 deaths were seen as preposterous. Today the US death toll stands at 500,000 Covid deaths and rising.
OB