Source: http://web.ltjh.kh.edu.tw/~lide97/3/c4.html

New policies such as the use of efficient energy, renewable energy, and energy conservation are all solutions to global warming.
Actions that can be taken immediately include the world agreeing to build cars with low CO2 emissions, electricity-saving appliances and energy conservation. People can also reduce the amount of greenhouse gases they emit, achieving immediate results. Major manufacturers have begun to try to reduce carbon dioxide emissions and save money at the same time, but there is still great potential for developing new technologies.
Developing and providing new clean energy technologies, such as wind power, solar power, hybrid engines, and alternative fuels, will help reduce global warming. ​
 

Improve energy efficiency and reduce energy waste, that is, energy should be saved. Saving energy has dual meanings:
Passive energy conservation refers to reducing the amount of energy used, but such savings may have negative consequences.
For example, using less electric lights may lead to insufficient light, which may lead to an increase in myopia patients. On the contrary, active expenditure reduction is to improve energy efficiency and productivity to promote more reasonable energy allocation.
To this extent, energy conservation programs should aim at increasing energy productivity, that is, using less energy input,
Achieving the same amount of economic output depends on the improvement of technological standards and energy efficiency management. On the other hand, in order to achieve the effect of energy conservation, external costs should be fully reflected in energy prices to comply with the user-pays principle and reduce unnecessary waste of energy.