Plant trees. Bare root (not growing in a pot) seedlings are very inexpensive and in many instances acclimate easier than larger more expensive trees. In warmer areas use water gel when planting to hold water so roots can absorb as needed. Decreases need for watering, fosters growth. 

https://en.wikipedia.org/wiki/Water_gel_(plain)

Academics: Global Warming Created So Many New Plants They Made Earth Colder

Andres Follett
Souce: Daily Caller

"Global warming is spurring so much plant growth that some parts of Earth are starting to cool, according to study released Thursday by Ghent University.

The study concluded that rising carbon dioxide (CO2) emissions are causing an increase in plant life, which generally has a moderate cooling impact on the local climate.

In warm areas, CO2 emissions increase the amount of leaf cover, leading to localized cooling. Cooler places see the opposite, with temperatures rising slightly since less sunlight is being reflected back from the surface from increased leaf coverage.

In total, researchers say that these effects have mitigated global warming by roughly 14 percent. ...."

http://dailycaller.com/2017/05/27/academics-global-warming-created-so-many-new-plants-they-made-earth-colder/?utm_campaign=thedcmainpage&utm_source=Facebook&utm_medium=Social