Cool the sun down. The sun is hotter than it's been in a millennium or so.
On this site, you can see the mean temperatures through the last 1,000 years.
It is not nearly as hot for as long as it was around the year 1,000AD. How do you think the Vikings got around so easily? In 1,000AD, wine grapes were grown in the UK. For a long time. Raw coal was burned in the 1800's and later, creating huge local pollution and yet the Dickens winters prevailed. Charles Dickens wrote about snow in London. It doesn't snow in London any more and coal made that city black.
You can read a discussion of it here:
NASA shows that the sun is blasting hot right now:
If you think it's hot now, what about 4,000 years ago when the Sahara was created (BBC news)
You can see sunspot generation history for 400 years:
And if you don't believe the Americans or Brits, the Swiss Professors have something to say as well:
You don't think the sun matters in the temperature of the Earth? How long after the sun goes down does it take for the air to cool down dramatically at your home? Maybe 15 minutes?
Just think if the sun got even hotter? None of the climate models shown by the media include the variable sun (yes, the sun's output is NOT constant) temperature and yet that is where we get every bit of heat from. Were in not for the sun, we'd be as cold and dead as the moon.
Temperature measurements are taken in cities where it's hotter, skewing the measurements. Less soil and more asphalt/concrete contribute to that. Sorry, we can't stop building.
There are local things you can do to affect climate change like acid rain and local heating in cities, sure. But global climate change is driven by the sun and nothing else. Humans are responsible for millions of tons of CO2 and such released into the atmosphere. The earth outputs BILLIONS of tons in the same time. Volcanoes, oceans, forests....all create CO2.
And, if you're not old enough to remember, in the 1970's there was a huge ice age scare. Everyone was supposed to warm up the Earth somehow. No one knows how the climate works, what it will do or when the next cycle will be. We can guess. At best. Scientists then admit they were guessing and still are.
With all these "great" computer models, we still don't have accurate weather predictions better than 3 days, sometimes even worse. You really think one can predict decades into the future using the same thinking and technology?
You can see the sea levels in the 1850's in Tasmania were 0.3m (1 ft) higher than they were today, as described by early polar expeditions. But if it's warmer today and cooler then, wouldn't the mean sea level have risen? No one can even explain that.
All of you promoting electric cars and such. Where do you think the energy for electricity comes from? Yup, fossil fuel burning plants in the US, nuclear in France, coal in Germany.
To all of you saying "Cover the oceans in something...". Do you have any CLUE how big the earth is? To cover just the Pacific ocean in a layer 0.001" (0.0254mm) thick, the thickness of a very thin sheet of plastic, it would take 395,147,800 (that's 400 million) cubic meters of material.
To put that in perspective, let's use coal. For the sake of arguement, we'll say the solution would be to use coal to coat the ocean (not that we would!) to cut global warming. The US produced 1133 million short tons of coal in 2005. If whatever you coated the Pacific with (ignoring all other oceans) weighed as much as coal, you would need 478 million short tons of material. You would need 42% of the US mined coal for one year to do this.
Assuming you could do this, then you need to fly it over the Pacific to drop it. If you could. The C5 cargo plane can carry 100 tons of material. Just say you could open the back and dump it out. That means you would need 4.7 MILLION C5 flights to just carry the cargo alone. How much fossil fuel would that consume and how much CO2 would that produce?