In the 1960s and 1970s, with the deepening of environmental protection movements in various countries, environmental problems became major social problems, and some environmental problems that crossed national boundaries frequently appeared, and environmental problems and environmental protection gradually entered the life of the international community.

1972 From June 5th to June 6th, 16, the United Nations held a conference on human environment in Stockholm. Government representatives and non-governmental people from 1 13 countries discussed the world's contemporary environmental problems and strategies for protecting the global environment.

The Declaration of the United Nations Conference on the Human Environment and the action plan for protecting the global environment proposed in article 109 were formulated, and 7 common viewpoints and 26 common principles were put forward to inspire and guide people all over the world to maintain and improve the human environment. It is suggested that the opening day of this conference be named "World Environment Day".

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Global warming causes glaciers to melt, ice sheets to shrink and ice shelves to break. German researchers pointed out that there are about 654.38+600 million glaciers in the world, and they are melting rapidly.

For example, the area of glaciers in the European Alps is reduced by one third and the volume is reduced by half compared with1in the middle of the 9 th century; Since 19 12, the glaciers on Kilimanjaro, the highest mountain in Africa, have shrunk by 80%. Glacier melting makes the frozen soil in the above areas lose its "adhesive" function, leading to frequent landslides and mudslides.

In addition, meteorological observations have found that in the past few decades, the permanent sea ice in the Arctic has been decreasing, and glaciers and frozen soil are melting. According to the analysis of satellite images, experts from the European Space Agency found that in the summer of 2006, about 5% to 10% of permafrost from northern Europe to the Arctic Ocean began to loosen and melt. In addition, in recent ten years, the three major ice shelves in Antarctica have collapsed, the glacier activities without the support of ice shelves have obviously accelerated, and the ice layer has also become thinner.