The earth is warmed up by the burning of fossil fuel. If we can compensate the generation of CO2 and heart by CO2 assimilation, global warming can is protected. To promote CO2 assimilation, supply of nutrient N and P is most important. Nature has a system to provide NOx when materials are burned or by thunder. These NOx is critically important for plant growth. When fossil fuel burned, much NOx is produced. If we use all produced NOx, we can protect global warming. Large amount of N and P is contained in drainage. The drainage should be released as it is. Deep sea water contain much nutrient N and P. Shallow sea water contain very little nutrient N and P. Agitation of deep sea water with shallow sea water increase the plankton growth. These methods are effective methods to protect global warming and to increase food and wood productions.