Thanks, Rogers, for your brilliant ‘rabbit' on the end of the world - at least you managed to put humour into the subject.

This topic is not new for NASA. They have a great website on environmental threats, including a children's section and games about living more economically.

You could refer to the World Bank website, which has been rabbiting on for years about a probable four degree Celsius temperature rise this century with devastating effects.

Then there's the World Economic Forum, which reports: 'Climate change and related impacts, such as extreme weather events, food crises and water crises, are among the most pressing global economic risks”.

The UK Royal Society and the US National Academy of Sciences have been on about this for many years. Even our government has a website on climate change.

The UN has been on about environmental constraints since at least 1974, made a strategy of sustainability in 1992 (the Earth Summit), and is now developing Sustainable Development Goals, to set a globally-consistent framework to guide us to a more sustainable pathway. Helen Clark plays a major role in this.

So why are we still threatened? Because we've been avoiding the really hard stuff – realising how fundamentally we need to change our lifestyles.

I wonder what our bright youth think about our inability to take the whole issue sufficiently seriously.

G Southon, Judea.