Well it is an Emergency, we gotta hustle

There are groups already doing the work. Look them up!

For example, BARK Out! Is active around Mt Hood in Oregon.

Depends on what you mean by "effective." It might delay them for a few hours or a day. There's a long history of this kind of thing, although it's usually more effective to do a treesit rather than a lockdown for trees. You could do a lockdown on equipment like bulldozers/feller bunchers though. The Earth First! Direct Action Manual has a lot of info.

Be prepared to be literally tortured in various ways, including pepperspray placed directly in your eyes, pain compliance holds, or they just cut the chains/lockbox you're in and if you get cut with it too bad.

Personally I'm not a big fan of get-arrested-on-purpose types of direct action, but it has its uses. I strongly recommend that if you're going to do something like this you connect with a group that knows how to do it and you have a support crew, including jail/legal support.

National Forests and National Parks are different things and are managed by different departments.

National Parks (like Yellowstone) are managed by the National Parks Service and we're put aside for conservation and public access. They are protected in perpetuity. As much of a shit head Trump is and as terrible as the Republicans are, I don't think they could actually open these up.

Meanwhile, National Forests are managed by the Department of Agriculture. They were specifically put aside to be public land and to protect the US lumber industry. The rules have been slowly opened up to allow private purchase (for individuals and ranches) and different types of resource gathering (mostly fishing and ore mining, with some oil mining).

I think a lot of people in this thread are mixing up the two as well. National Forests are specifically used for resource gathering and more resource gathering isn't out of the ordinary for these parks.

the map shows the northwest will be more concern, all that redwood forests,

Why do you think that company is called Palantir lmao. I wish I wasn't joking, but it is this stupid if you poke around a bit at the neoreactionary obsessions with LOTR.