"Massive reforestation" refers to the extensive planting and regrowing of a large number of trees in an area that has undergone deforestation or has lost its forest cover. Full definition
Climate scientist James E. Hansen has made a compelling case that we could pull 100 billion tons of carbon from the air by massive reforestation — limiting land use enough to allow forests to grow back to their extent before human deforestation. (scientificamerican.com)
My plan starts with Hansen's targets, his implementation of substituting low carbon technology for high carbon, and his requirement for massive reforestation. (realclimate.org)
Most likely that will mean massive reforestation plus a combination of energy crops with carbon capture and storage. (e360.yale.edu)