"Bill Gates, the Microsoft billionaire, is funding research into machines to suck up ten tonnes of seawater every second and spray it upwards. This would seed vast banks of white clouds to reflect the Sun’s rays away from Earth... A fleet of 1,900 ships costing £5 billion could arrest the rise in temperature by criss-crossing the oceans and spraying seawater from tall funnels to whiten clouds and increase their reflectivity."
Apparently every cloud has a Silverlight... sorry, silver lining.