If it takes 50-100 years to grow back, then the CO2 is still in the air during this time plus you reduce a lot of habitat and create deserts. If all the energy

If it takes 50-100 years to grow back, then the CO2 is still in the air during this time plus you reduce a lot of habitat and create deserts. If all the energy we consume today for heating, cars, electricity etc would come from biomass/trees then a huge part of our forests would have to be cut down in just a few years time, before they have a chance to grow back.