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We’re all familiar with tipping points, when crossing what might seem a minor threshold can lead to drastically different outcomes—the Super Bowl favorite that falls to last place with injury to a single lineman, a tomato seedling that surges skyward the moment it tops the shadowy confines of its clay pot.

Human well-being will be severely jeopardized by negative trends in some types of environmental harm, such as a changing climate, deforestation, loss of access to fresh water, species extinctions and human population growth, scientists warn in today’s issue of BioScience, an international journal.

As the city of Houston continues to recover and rebuild following the historic flooding unleashed by Hurricane Harvey, the region will also have to prepare for a future in which storms of Harvey’s magnitude are more likely to occur.

T-cells are one of the immune system’s major weapons. They detect the body’s cells infected with a virus and trigger their ablation, effectively killing the virus. T-cells cannot do the same with cancer cells, however, as they do not recognise them as foreign cells and are therefore unable to eliminate them.

The final warning was issued on Tropical depression Haiku on Nov. 12 as it was dissipating due to strong vertical wind shear. NASA-NOAA's Suomi NPP satellite passed over the storm as it was fading.