> How much would we need to plant to reduce carbon to preindustrial levels About 2 trillion trees per year, just to break even on current rates of CO2 emission

> How much would we need to plant to reduce carbon to preindustrial levels About 2 trillion trees per year, just to break even on current rates of CO2 emissions. More to reduce it further. For reference, there's currently an estimated 3 trillion trees on Earth.