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Ocean acidification has impacts other than simple changes in pH, and these may need boundaries too.

Five per cent is a reasonable limit for acceptable ozone depletion, but it doesn't represent a tipping point.

For nitrogen deposition as for other pollution, waiting until we approach the limits of environmental degradation merely allows us to continue our bad habits until it's too late to change them.

Setting a limit on long-term atmospheric carbon dioxide concentrations merely distracts from the much more immediate challenge of limiting warming to 2 °C.

A global limit on water consumption is necessary, but the suggested planetary boundary of 4,000 cubic kilometres per year is too generous.

A boundary that expresses the probability of families of species disappearing over time would better reflect our potential impacts on the future of life on Earth.

Emissions from cattle and sheep are significant contributors to planetary warming. But how close are we to creating low-emitting livestock? Kevin Morrison reports.

Oxford economist Dieter Helm co-edits a new book, The Economics and Politics of Climate Change, due out next month. Anna Barnett caught up with him in London to get his take on a long-term strategy for reducing emissions.

Last week, India laid out an ambitious plan for solar energy. Anna Barnett looks at how far it will go in reducing the country's carbon footprint.