'Cloud ship' scheme to deflect the sun's rays is favourite to cut global warming

Selected quotes from article:

"Ships with giant funnels which travel the world's seas creating more clouds to deflect the sun's rays could help cut global warming, say scientists."

"The project, which is being worked on by rival US and UK scientists, would see 1,900 wind-powered ships ply the oceans sucking up seawater and spraying minuscule droplets of it out through tall funnels to create large white clouds. "

"These clouds, it is predicted, would reflect around one or two per cent of the sunlight that would otherwise warm the ocean, thereby cancelling out the greenhouse effect caused by Carbon Dioxide emissions"

Wow. These guys are geniuses!

But, how do you explain that water vapor will cool the earth, when scientists also say that water vapor contributes to global warming?
http://news.mongabay.com/2008/1117-water_vapor.html

The heat-amplifying effect of water vapor in the atmosphere could more than double the climate warming caused by increased carbon dioxide levels, report researchers using NASA data.

While is has long been known that water vapor is an important greenhouse gas, its contribution to global warming has been hotly debated. Now, according to NASA, Andrew Dessler and colleagues from Texas A&M University in College Station have calculated to heat-trapping capacity of water vapor.

"Everyone agrees that if you add carbon dioxide to the atmosphere, then warming will result," Dessler said. "So the real question is, how much warming?"

NASA says the impact can be determined by estimating the magnitude of water vapor feedback:
Increasing water vapor leads to warmer temperatures, which causes more water vapor to be absorbed into the air. Warming and water absorption increase in a spiraling cycle.

Water vapor feedback can also amplify the warming effect of other greenhouse gases, such that the warming brought about by increased carbon dioxide allows more water vapor to enter the atmosphere.

"The difference in an atmosphere with a strong water vapor feedback and one with a weak feedback is enormous," Dessler said.

COULD IT BE THAT THEY DON'T KNOW WHAT THE HELL THEY ARE DOING?
COULD IT BE THAT ALL THIS TINKERING WITH CLIMATE COULD BACKFIRE?