Peak Oil *

The likelihood is that we are at or approaching the downside of the oil production curve. We rely on oil for much of our energy production, as well as being used throughout our system of industrial production. How can our society adapt to both of these challenges simultaneously? (#13987)

Scale and growth of the human population *

(#38036)

Aquifer Depletion *

In many areas across the world we are already depleting aquifers much faster than they are being replenished. (#13990)

Philosophical issues? *

(#42384)

Pollution of the Biosphere *

Biological systems have not evolved to be able to respond to toxic manmade substances such as DDT. Many of these are disruptive of biological systems, especially animal hormonal systems - leading to increased illness in humans and animals. (#13991)

Exhaustion of natural resources *

In the next decades, most of the resources exploited by human beings will experience their peak of production. (#27521)

Food supply *

(#39200)

Species Extinction *

Our ecosystem is undergoing the largest species extinction since the Permian period 250 million years ago. The likelihood of this causing ripples affecting humanity is very high. (#13988)