Crisis

In the view of many leading scientists and institutions, we are currently in the midst of an environmental crisis, the magnitude of which is underestimated by the majority. The crisis poses an imminent threat to the survival of homo-sapiens if it is not addressed immediately. The environmental calamity has emerged in the form of several sub-issues, primarily the anthropogenic climate change (or global warming), the depletion of stratospheric ozone (the 'ozone hole'), the acidification of surface waters (or acid rain), the destruction of tropical forests, the depletion and extinction of species, and the precipitous decline of biodiversity.

Since 1990, it is estimated that 420 million hectares of forest have been lost through conversion to other land uses (this means we have lost approximately 14 million hectares of forest every year for the past 3 decades). This mean approximately 5,25,00,00,00,000 trees have been cut.
The planet's average surface temperature has risen about 2.12 degrees Fahrenheit (1.18 degrees Celsius) since the late 19th century, a change driven largely by increased carbon dioxide emissions into the atmosphere and other human activities.
Ice sheets are melting at an exponential rate. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost an average of 279 billion tons of ice per year between 1993 and 2019, while Antarctica lost about 148 billion tons of ice per year.
Global sea level rose about 8 inches (20 centimeters) in the last century. The rate in the last two decades, however, is nearly double that of the last century and accelerating slightly every year.
Since the beginning of the Industrial Revolution, the acidity of surface ocean waters has increased by about 30%. This increase is the result of humans emitting more carbon dioxide into the atmosphere and hence more being absorbed into the ocean.
The ocean has absorbed between 20% and 30% of total anthropogenic carbon dioxide emissions in recent decades (7.2 to 10.8 billion metric tons per year).
416 parts per million - the concentration of carbon dioxide (CO2) in our atmosphere, as of May 2020, is the highest it has been in human history.