Edited: I would like to spend money in the most effective ways (local tax considerations included)
I understand that in order to be effective at tackling climate change there needs to be action at a level of global emissions. That isn't to discount the importance of individual concessions. But for the sake of this question, let's assume I have taken all reasonable steps to minimize my personal carbon footprint. To the point that any additional reduction requires non-trivial investments of time / money.
I would like to know what are the most cost effective ways of spending money to reduce emissions. Not large amounts by any means, but enough that I would prefer not to be throwing it away without thinking about how far it will actually go.
At the moment it seams to me that investing the money in the founders pledge climate fund would be the most effective. Although I am located in Australia, and so would be unable to get any tax benefit from that. Is there a more tax effective equivalent for Australian tax residents?