Environmental stress is an action, agent, or condition that impairs the structure or function of a biological system. This environmental stress can be natural, like hurricanes, droughts, floods and fires for example, or ...

Some claim that humans are too numerous to become extinct. However, passenger pigeon, once the most numerous birds on the planet, are now extinct. For years, humankind has been damaging its habitat, discharging toxic ...

In this age, large demographic shifts will have many negative effects on the quest towards sustainability. Any rate of growth that results in an overall population gain is unsustainable. Therefore, immigration must be ...

During the five great biotic extinctions, huge numbers of species were lost. Over evolutionary time, biodiversity was restored and sometimes exceeded previous levels. This environment might well be described as a pulsing ...

With the era of cheap, abundant fossil energy ending, the acquisition and production of material goods will be diminished. The availability per capita will depend primarily on two factors. First, it will depend on the ...

Some people alive in 1940 may remember a portion of the famous speech given on 13 May 1940 by Sir Winston Churchill to the British public. The speech was given during the dark days of World War II for the British when all ...

Cairns, to please friends who frequently comment about the depressing subjects of his writing, attempted to create a list _blowing sunshine or highlighting the good news, if any, about global warming.

Inversion formulas are obtained for the restrictions of the Hartley and Hilbert transforms to R+. Regularity results are derived, and an illustrative example presented.

Rapid climate change is causing ecological disequilibrium in many parts of the planet, which makes restoration of natural ecosystems to predisturbance conditions less probable. An alternative to restored ecosystems may be ...

Peak oil may have been reached in 2007, if so; a new source of energy will be needed. Coal would be a poor substitute as it produces twice as many greenhouse gas emissions when burnt, and biofuels have huge drawbacks, as ...