Organisations run on a charitable basis in this space on balance tend to be less transparent on impact than organisations run as businesses, which are better focused on effectively managing and reporting impact[1].

Oikocredit is probably my favourite and investing in climate-smart agriculture at the moment. They should also give you your money back.

One thing to bear in mind is that adaptation at this point is as important as mitigation.

[1]The reason being that on balance they have more resources available for management.