Thousands of scientists have issued a dire warning about the impact of human actions on our planet.

In 1992, 1,700 scientists warned about dire consequences if we didn't lessen our dependence on fossil fuels, work to control the world population, and stop deforestation. 
As that advice has apparently not been heeded and many conditions have worsened, 15,000 scientists hailing from over 180 countries have issued an updated advisory.
In an article called, "World Scientists' Warning to Humanity: A Second Notice,"  the authors and signatories note that unless habitats are protected, alternative energies incentivized, and pollution is brought under control, the already fragile biosphere cannot be safeguarded and our future will remain in jeopardy. 
Citing various human efforts to reduce ozone-depleting substances, the piece suggests there is hope "that we can make positive change when we act decisively." 
Recommended next steps include halting forest and grassland conversions, establishing and maintaining reserves, encouraging humans to eat less meat, and, in an effort to curb further population explosion, ensuring all have access to family planning. 
"Soon it will be too late to shift course away from our failing trajectory, and time is running out," the group says at the end of the article. "We must recognize, in our day-to-day lives and in our governing institutions, that Earth with all its life is our only home."