It's really not, because the data can be peer reviewed, and if it doesn't match up it gets redacted and careers can end. While there are problems of fudging data in the sciences sometimes, it's extremely rare for such high profile studies because there are so many various groups doing the same thing. Additionally both "sides" have commissioned studies and they came to the same conclusion, even though one side wanted different results. Most of the data is publicly available, people just have to look for it. The point is when there's overwhelming scientific consensus the idea that people should listen to a bunch of politicians that have no idea what they're talking about is really... Well dumb to be blunt. If you want to look at the data and read the data you're free to do so, but if you don't understand the data (and the overwhelming majority will not) then you should listen to the experts who do know how to read and understand the data. Why wouldn't you? And at any rate what happens if they're wrong? We advance to better, technology that creates tons of jobs for no reason? BFD.. What happens if they're right? The world becomes uninhabitable and we all die.
It kind of seems like a no brainer to me to be honest. The technology we develop could have massive implications, that would save us tons of money. For example, there are teams developing glass that are solar collectors with the goals to make them efficient enough you can put them on skyscrapers and they'd pay for their own energy consumption, same thing with homes and even cars. Imagine a life where you don't have to pay electricity bills, and then you get into your car, which you don't have to pay for gas, and you're driven to work by an automatic car which allows you to catch up on e-mails or what most of us will do, just browse ROD for your commute to your job that offers a higher salary because their overhead has been reduced because they no longer need to pay for electricity in the building (hey, it's not a big raise, but a raise is a raise). That stuff is attainable in our lifetime, we just have to fund it rather than actively suppress it as we're doing now.
While the planet will go through natural hot and snowball phases, the problem is when you look at the data we're not in a natural phase, we're quickly racing towards the upper limits to trigger runaway greenhouse gasses, and that's very very dangerous (it's why Venus went from a paradise to an uninhabitable hell). There could have been life on Venus at one point, it wouldn't shock me in the slightest if we were to learn that (same with life on Mars), but if there was, before it got a chance to evolve and leave the planet it became uninhabitable. As the Sun burns through it's fuel and begins dying, it'll slowly make our planet uninhabitable... Or rather not so slowly on the scale of the universe, as we're talking less than a billion years (and we're still about 5 billion from the sun becoming a shell burning star). Pretty soon life will need to occupy under ground and around the poles, resources will be very scares. That means we don't have a lot of time to find another rock to live on, and instead of trying to buy is more time, and develop the technology needed to find and get us to that new rock, we have people trying to hit the afterburner. It's just bad ju-ju.
You know how in every disaster movie there's a scientist trying to warn the president that it's all about to go to crap, and then he gets ignored and it all goes to crap? And everyone goes "It was so obvious, why didn't they just listen?" Well it's that opening scene and the scientists are raising the alarm. If it scares the hell out of those of us who work with the data it should scare everyone else.
It's no different from when I was doing a HVT op in Afghanistan and my team leader got the order to follow the HVT across into Pakistan into the mountains, despite all the locals telling us there were several hundred fighters about two miles in waiting for us to arrive so they could ambush us. The look my TL had on his face was one of "Well, we're going to die" and it scared the living hell out of every single one of us. Especially because he had been there before, he was an old school Ranger, who fought in the battle of Takur Ghar (I highly suggest reading into it if you don't know the story), and knew what it was like to be up shits creek without even a boat let alone a paddle. If not for our First Sergeant going into the TOC and pulling wires to shut down all the video feeds and comms, we would have gone in there, and after looking at the FLIR images I know why he shut down those feeds (and subsequently lost his position as he was moved to train West Point students, a career ending move that he said he'd make again and again without second thought).. There were a lot of enemies in those hills and I would not be here today had we taken that walk.
In fact, they shot down our evac helicopter (helicopter crashes are not fun FYI lol) and if not a Spooky overhead, some amazing A-10 pilots and a ballsy Blackhawk pilot who gave himself about 2 inches worth of rotor clearance to allow us to get on and bail, we would have gotten overran, and that air support wasn't available over the boarder.
But before I digress too much, when someone who knows what's going to happen has that "Oh crap" look, it's typically a good idea to listen to them. Because if they're wrong it's not a big deal, but if they're right then we're not in for a good time.
That's mostly my point on that. Again though, my research is, was, all about us finding a new rock to move to.
That's mostly just a little joke from the "I learned it from watching you!" PSA's.. I actually hate a lot of the laziness and general "gimme gimme gimme" of my generation. My brother is a prime example of that and it drives me nuts, but that's for another thread!
I believe it comes from reviews done on NASA, as well as the National Review (which you need an account for). NASA releases a bi-monthly ROI report on what they've accomplished/progress, but it doesn't go into numbers.
Here's a cool little infographic that will talk about it slightly, and they have a bunch of sources cited.
https://www.greatbusinessschools.org/nasa/