Global warming

originally, June is the start of summer. but weather is still cold and daily range's gap is big.
so my friends spend a hard time because of cold. some trees reverse their leaves' color to red or
orange. korea's weather and ecosystem is changed. but I believe we can prevent these variation
with personal and national effort.
first, using high-efficency products and taking public transports are one of fine ways which we can do personally. high-efficency energy products reduce use of electricity and energy.
car is Co2 emission machine. car emits a variety of bad gases. it's main reason of global warming. so if you take public transports rather than cars. it will decrease density of Co2 in air.
Second, nation should promote substitution energy and encourages companies to develop it.
Development of energy shortens use of coal and oli. before start of development, government must make laws and regulate it strictly. next, governments have to prevent global warming together. contries participate and follow international environment like kyoto protocol. and international organization watch countries' environment policy.

If we effort hard to prevent global warming, we will live in clean nature.