If you care about offsetting environmental costs of travelling, etc. consider donating to coolearth.org! About 70$ can offset an average carbon footprint for a whole year I think... It‘s one of the most effective charities against climate change and comes recommended by people such as Will MacAskill and Peter Singer who have founded a movement concerned with effective charity or „doing good better“. https://www.effectivealtruism.org/doing-good-better/
It's kind of sad to realise reading a comment like this now makes me instantly suspicious about whether or not this is "true" enthusiasm or something motivated by profit. It's a fundamentally hard problem to solve, but IMO it is one of the bigger hurdles facing places like this now.
Even when you're not doubting the recommendation enthusiasm, it's hard to not be suspicious of the charity itself, given how badly most of them are managed.
