The answer to this question is that there are many major contemporary international or global environmental problems, ranging from climate change and air pollution to biodiversity loss and ocean acidification. These issues require urgent attention if we hope to ensure the health of our environment for future generations.

Climate change is one of the most pressing environmental concerns of our time. It is caused by an increase in average global temperature due to human activities that release greenhouse gases into the atmosphere, such as burning fossil fuels or clearing forests for agricultural land use. The effects of climate change can be seen in rising sea levels, extreme weather events like floods and droughts, melting glaciers, and changing patterns of vegetation across the globe.