Where are you going to plant these millions of trees? What existing land suitable for sequoia growth is not currently full of sequoias? If that land is suitable

Where are you going to plant these millions of trees? What existing land suitable for sequoia growth is not currently full of sequoias? If that land is suitable, but not forested, why? If it's being used for something else, what are you going to displace? Like many feel-good solutions to major issues, there are a host of reasons why they're not already happening or why they wouldn't actually solve the problem.