Geoengineering

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Volcanoes produce large amounts of a gas that interacts with air to produce sulfate aerosols, which act as tiny mirrors in the atmosphere to reflect sunlight – and heat. NASA

Can solar geoengineering be part of responsible climate policy?

Blocking the sun by injecting tiny particles in the atmosphere – called solar geoengineering – can lower the Earth's temperature but has some real costs. Economists run the numbers.
The engineers' realm extends far beyond construction – it bridges the gap between research and practical application. paul bica/Flickr

Building the nation will be impossible without engineers

AUSTRALIA 2025: How will science address the challenges of the future? In collaboration with Australia’s chief scientist Ian Chubb, we’re asking how each science discipline will contribute to Australia…
The future is in your hands, tread carefully. bbcradio4

Astronomer Royal on science, environment and the future

This is a transcript of a speech given at the British Science Festival in Newcastle on September 12. It’s always a pleasure to speak at the British (Science) Association, but there are two special reasons…
Sendai, Japan after the 2011 tsunami: imagine nature’s destruction at the push of a button. US Navy

The strange military origins of environmentalism

The words “environmentalism” and “military” are not typically found in the same sentence. Yet ideas about our vulnerability to environmental change are directly linked to military plans for a third world…
Measurements in the skies over Hawaii show we’ve reached a carbon dioxide milestone, but geo-engineering won’t get us off the hook. J.S. Nawati

Carbon dioxide hits a new high, but geo-engineering won’t help

This week, carbon dioxide concentration in the atmosphere finally crossed the 400 parts-per-million mark. The last time that happened was 3-5 million years ago during the Pliocene epoch, several million…
Altering the ocean or atmosphere is expensive, but not out of reach for countries or rich individuals. What if they decide to go ahead? Martin Thum

Anyone can geoengineer: should we try to stop them?

International climate change negotiations have not been successful. As Richard SJ Tol stated at the beginning of the 2012 Doha talks, “[h]aving flogged, ever harder for 18 years, the dead horse of legally…
The effects of climate change are becoming more apparent - who will take responsibility for the delay in action? AAP Image/Tracey Nearmy

Humanity’s scorched Earth program – where to now?

The intensity and frequency of bush fires and firestorms around the globe, including recently in Australia, is a growing worry. Under conditions where mean land temperatures have increased by ~1.5 degrees…

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