There are organisations varying from grassroots to global where you can participate in such purchases with nominal sums, and end up with small parts of land in your name, collectively owned with other participants, or probably something in between.
Here is one (that I know about because my employer currently offers an option to use some of our open source contribution rewards for that): https://www.helsinkifoundation.org/
Here is one (that I know about because my employer currently offers an option to use some of our open source contribution rewards for that): https://www.helsinkifoundation.org/