Genetically modify an algae or plankton to change color in response to an electromagnetic signal. Then beam the signal (microwave, radio, other?) from a geostationary satellite onto large areas of the ocean seeded with the algae.
The billions of color-changing organisms would effectively make the surface of the ocean darker or lighter such that it absorbs more or less heat from the sun. With this, you could create thermal updrafts, moving huge air masses when and where you want them. You could potentially create rain for irrigation of crops or wind for wind turbine farms. Hey, this might make a good plot for a James Bond movie...
CATEGORY: Energy / Technology