How many humans can Earth sustain?

“Population-dynamics science tells us two things broadly about invasive animal population trends. Typically, the population of an invasive species that moves into a new area and is freed from predation will boom — it expands beyond what is called the “carrying capacity”, and diminishes the food and resources it needs to sustain itself in the process. In the case of humans, modern medicine and technology have facilitated that boom. Things that used … Read more

Show me your climate solution

Greta Thunberg is the Swedish teenager who so dramatically made the world take notice with her candid, incisive calls for action on combatting global warming. Here is a part of Greta Thunberg’s speech that she gave to the British Parliament in April 2019: “Many people say that we don’t have any solutions to the climate crisis. And they are right. Because how could we? How do you “solve” the greatest crisis that … Read more

Extinction Rebellion

I became a member of this group not long after it was formed in the UK. At the time I thought it, like so many similar movements, might prevail on the margins of political action, but I liked its objectives and so added my name to its small list of supporters. This past week has been quite an eye-opener. The demonstrations, especially in London, by ER have raised not only the group’s … Read more

Will we survive?

When I was young our existential fear, despite the doctrine of Mutually Assured Destruction, was nuclear annhilation. With the collapse of the Soviet Union, this fear evaporated and for a while we enjoyed a period of relative safety. Only recently have we woken up to an even greater threat to our future wellbeing, namely that of global warming. There is no doctrine to assuage our fears this time, rather we’re faced with … Read more

China’s taking too much fish

I saw in the news that China consumes 50% of the world’s caught fish. In economics, exploiting shared resources is called “the tragedy of the commons” and refers to the common grazing area used by a community of farmers. When they share equitably, there are no problems, but when one adds extra livestock to graze, he depletes the land available for the rest. If he continues to do that, the others get … Read more

Antarctic ice melting faster than ever

“Ice in the Antarctic is melting at a record-breaking rate and the subsequent sea rises could have catastrophic consequences for cities around the world, according to two new studies. A report led by scientists in the UK and US found the rate of melting from the Antarctic ice sheet has accelerated threefold in the last five years and is now vanishing faster than at any previously recorded time. A separate study warns … Read more