Planting trees is a great thing for urban and rural environments, but one "renegade" group is thinking big! Archangel Ancient Tree Archive is taking some small cuttings from large, ancient sequoia trees and propagating them into thousands of redwood saplings that will then be planted. The idea is that these large species will be able to store more carbon. Certainly there is something to that idea. Wood that ends up in a landfill doesn't fully decompose and actually counts as a carbon sink in the US EPA's Waste Reduction Model. So the idea of planting more trees to help sequester greenhouse gases is a great idea - particularly if we can keep them alive. Plus many tree species offer significant co-benefits including reducing particulate matter, reducing water runoff, and providing shade in urban areas that reduces energy consumption and the urban heat island effect. So whether one plants a few giant trees, or many smaller species, the sentiment by one observer at the end of the article is right on: at least do something!
To read more about what this team of pioneering arborists is doing, read the SF Chron article here.