Green Environment>The Problems   

The Problems：
You know:
CO2 can impede dispersion of the sun’s radiation which causes 'the greenhouse effect'. It causes glaciers to melt, temperatures and sea levels to rise.
Batteries which contain heavy metal like mercury can pollute the environment without proper recycling.
You don’t know：
What are 'the greenhouse effect' and greenhouse gases?
  The greenhouse effect occurs when the energy and temperature balance of the Earth is affected by infrared waves from sunlight absorbed by the Earth’s atmosphere. With the protection of the atmosphere, the surface of the Earth maintains an average temperature of 15℃; otherwise the average temperature would be lower than -18℃. The process in which the atmosphere makes the surface of the Earth remain at a constant temperature by absorbing more infrared waves than reradiating to space is referred to “natural greenhouse effect”. However, as a result of more greenhouse gases produced by human activities, more infrared gases are kept on the surface which contributes to the “enhanced greenhouse effect”.
  The percentage of greenhouse gases in the atmosphere is less than 1%. The concentration is dependent on the balance of gases interaction. Human activities can affect the proportion of each greenhouse gas, and change the concentration of greenhouse gases. The dominant greenhouse gases are CO2, CH4, N2O, N2O and O3.
  Consequences of the greenhouse effect
  The exhaust emissions of vehicles affects the greenhouse effect heavily and causes agricultural damage of over USD 10,000,000,000 every year. The main reason is ozone. There is a thin ozone layer in the stratosphere to protect our life because the layer can filter ultraviolet radiation which may damage our DNA. However, ozone is dangerous on the ground because it is harmful to our respiratory tract and shortens our life. Unfortunately, ozone can be synthesized by CO and volatile organic compounds (VOCs) emitted from vehicles.
  Climate change and ecological disaster
  Increasing the concentration of greenhouse gases causes less outgoing infrared radiation, so the Earth’s atmosphere must change to reach a new balance between incoming and outgoing radiation. The change will raise the temperature of the Earth’s surface and lower atmosphere, and cause global warming. The average temperature of the Earth now is 0.6ﾟC higher than three decades ago. It’s the average highest temperature of the past one million years, and has caused 1/3 of all spicies extinction. 27% of extinct spicies are marine life, 28% of them are in fresh water, and the other 31% are on the land. 0.6ﾟC may be too small to adjust on an air conditioner, however, a 2ﾟC rises in the average temperature can destroy the whole ecological system. If the Earth is a machine, its current utility rate is 125%, and will be up to 200% in 2065. That means we will need two Earths to provide the resources maintaining our life.
  Sea level rise
  “Global warming” is happening, and sea levels will rise as a result of the following reasons: First, thermal expansion of seawater raises the sea level. Second, melting glaciers from the Arctic and the Antarctic increases seawater. The melting ice of Greenland can raise the sea level by 7 meters and the total melting ice of the Antarctic can raise the sea level by 65 meters, which will flood any houses lower than 20 floors. As we know, over half of the human population lives along the coast. When it happens, can you imagine how many refugees there will be? How should we relocate our living area? And what will the outline of the world look like?
  Agricultural impact
  Experiments have proven that higher CO2 concentrations can accelerate a plant’s growing path. However, due to climate change caused by global warming, global precipitation pattern change, unusual flood and drought will cause more serious damage on the agricultural harvest. According to the investigation by the New European Commission, the most serious agricultural loss caused by global warming is in India, which costs USD 5 billion per year. China is in second place which loses 2.5 USD billion per year, then come Iran, Pakistan, Turkey, and the east and west coasts of North America. Additionally, research found that the farmers of Europe and the Soviet Union lose USD 7.5 billion because of global warming per year.
Traditional dry batteries or alkaline manganese batteries contains mercury which may cause the malfunction of the central nervous system and kidney(primary battery pollution). On the other hand, although lead-acid batteries are rechargeable, the acid fog and toxic water brought by production processes still cause serious environmental damage. The other widely used Ni-Cd batteries can poison the ground with leaking cadmium, or contaminate air with cadmium stream when incinerated(secondary battery pollution).