More Ideas to Follow

I've been thinking about Terraforming recently. Been looking into it a bit to learn what the challenges are and where such tech might be at. Mostly I just feel dumb looking at the information provided, but I still pose my own questions. For example, could you slowly expand an atmosphere? Like, build a small, sealed greenhouse on another planet, filling it with plants that would fill said greenhouse with oxygen and basically setting up what is needed for humans to live on it. Then over time have the green house expand and expand as more trees and other plants are added and as it slowly spreads across the planet the atmosphere gets bigger and more gases that are needed for life fill the air above the planet. On that same level, have we managed to create weather in contained spaces? Perhaps we create a miniature earth where we replicate conditions that would create types of weather, including an artificial sun and things like that. Could that produce weather in an enclosed place? I'm basically wondering if a water cycle could be restarted on a planet like Mars, to go with the growing atmosphere and the trees. So that you could have less dependence on a watering system and if it came time to just open the greenhouse to let the atmosphere out onto the planet proper, a weather system would be practically in place.
Could a space elevator be built anywhere on the world if the conditions were right? Said conditions are things like planes and weather not destroying it. Could a space elevator be built at one of the poles? Or since our planet doesn't spin that way, would the anchor in space not work? I know we currently don't have anything that could make up such a space elevator, material wise, but I like to think of things to come. If we managed to build a space elevator, we could build bigger ships and space stations easier. We wouldn't be spending fuel to get fuel into space, which limits how much fuel the ship could carry anyway. With a space elevator all the fuel could ride on it up into orbit, and be put to use in ships that are built in outer space. We wouldn't have as much in the way of weight limitations and we could possibly build colony ships or deep space exploration ships. We could be exploring the galaxy in no time. Especially if what I hear about a near FTL drive is even remotely possible. Some scientists seem to be coming up with ideas about how to reach the speed by distorting the space in front of the ship, which would move space around the matter of the vehicle, which seems to be the problem with reaching light speed. I'm probably getting everything wrong, but this is mostly stream of consciousness and I don't really want to go looking for the facts right now.
Can sound itself disrupt air? I've always really loved the idea of sonic weapons that aren't just sound, they can strike targets and move them. Or in a different application, be used to move the subject that fires it. I figure if sound could disrupt the air, it could probably have a physical presence enough to move objects.
I still want to learn about fire fighting techniques for wild fires and fires in hard to reach places like mountains and ravines. It seems like so many of the methods are simply, let it burn itself out and hope it doesn't catch something else on fire. That seems inefficient. I watch videos of the planes and helicopters dropping water and fire retardant and it looks like it gets too spread out to really help affect the fire. One of my previous ideas I've modified. It's less a fire truck on spindly legs, and more of a support vehicle now. It doesn't fight the fire itself, but more of a troop transport. High temperature resistant hull and when the firefight gets literally too hot for the fighters to stand, they can retreat inside until it's safer or even pull out. Inside would be benches on either side for them to sit, masks, oxygen tanks, other supplies that may get damaged or lost or otherwise need to be replaced. The shell would still be armored for falling trees or other debris, but it's not a tank to fight the flames anymore, more like an armored car.