1. Resource-saving technologies
경제학과
차미연

2. Nitrogen
Beginning of the 20th century was a shortage of nitrogen, a vital input plant growth.
German chemist, Fritz Haber(1909), Solved the problem of nitrogen fixation
-first synthetic chemical fertilizer.

3. Japanese attack on Pearl Harbor in 1941
Rubber
U.S. rubber = Natural rubber(1941)
The U.S. government organized a crash scientific program to develop synthetic rubber.
By 1945, U.S. rubber
85% of the rubber consumed was synthetic.
Japanese attack on Pearl Harbor in 1941

4. Nuclear Fusion
Nuclear Fusion, the reaction that powers the sun and also the hydrogen bomb.
The advantages of fusion
Limitless supply
global warming won`t affected
Long-lived nuclear waste won`t produced

5. Solar Energy Sunlight is Plentiful, clean, and cheap.
In the past, the price was high, but not now.($50→$3 per watt)
The price of electricity produced from photovoltaics will fall below the price of electricity from burning coal around the year 2030.

6. THANK YOU