Worthless telescopes vs Warming earth

BBC NEWS | Science/Nature | Telescopes 'worthless' by 2050

There is a bigger, scarier side to this story than the possibility of astronomers losing out on their nice, clear view into space. Let me throw a hypothetical situation at you. Let's say, for instance, the powers-that-be took up these astronomers' cause and decided to ground planes for the sake of astronomy. That'll never happen, but let's say it does. Well our earth would get hotter, faster than we'll be able to handle.
Back in 2001 after the 9/11 attacks, scientists had the perfect opportunity to study just how much an impact contrails have on climate. Remember how planes all over the United States stopped flying for three days? There was a major spike in temperature as a result of the planes being grounded.
You see, the contrails are good for something. They're keeping global warming slightly in check. Polluted clouds do the same thing. It's a process known as Global Dimming. Lots of tiny dirty particles in the upper atmosphere act like magnets, attracting water molecules. The more dirty particles there are, the more tiny droplets form reflecting the sun's solar energy back out into space like mirrors. The less solar energy that hits the earth, the cooler it is.
Of course there is the flip side - Global Warming. That's where invisible gases cause a greenhouse effect warming everything.
It's ironic. The dirty pollution is keeping the earth cool. The invisible pollution is warming the earth. Right now the invisible pollution is winning. The earth is getting warmer.
While it is a crappy thing that astronomers might not be able to see from ground based telescopes in the near future, it's not nearly as bad a situation as we would face if we grounded all air traffic without looking after the root cause of global warming first.