The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The scientific data that encouraged nations to protect the environment is the level and air pollution produced in major cities of the world with their industries, as is the case of the United States of China. The same for air and water pollution.
Another reason is the evidence of climate change due to global warming.
Other important scientific data is the soil degradation in lands that used to be very fertile to grow crops. Most countries have overexploited raw material and non-renewable natural resources. Jungles and forests are faced with biodiversity loss and deforestation due to excessive industrial practices.
Regarding the sea, most oceans present acidification and plastic trash in different regions of the oceans.
The problem is that major industries around the world did not have any respect or consideration for taking care of nature. These industries were only interested in big profits no matter what. They produced their goods and polluted the air, polluted the water, and also contributed to noise pollution.
