Many believe blockchain technologies (BCTs) will soon permeate our lives. In particular, they can be utilized to help tackle global climate change. This Article provides a baseline description of BCTs, and ways they can be utilized to reduce GHG emissions in electricity and energy generation; agriculture, forestry, and other land use; industry; and transport. It addresses BCTs’ potentially carbon-intensive nature, identifies ways to utilize them in a less energy-intensive manner, and discusses currently implemented and potential ways in which BCTs can be harnessed to mitigate the main causes of climate change.