Abstract

We may want to cool the planet if (when) we fail to meet our CO₂ emissions targets. There are “geoengineering” technologies out there almost ready to go and some sound quite scary. Many pundits question whether it is safe to meddle with the climate when we only have one Earth, but others argue that we haven’t much time left before climate change runs away from us.

This talk will present two technologies, one SRM (Solar Radiation Management) and the other GGR (Greenhouse Gas Removal). The SPICE project ( www.spicepipe.co.uk ) is an SRM technique that attracted a great deal of attention as it considered a means for injecting aerosols into the stratosphere using a tethered balloon. The SPRNGG project ( www.sprngg.com ) is a non-CO₂ GGR approach that looks at air capture of the other important greenhouse gases methane CH₄, Nitrous Oxide N₂O and CFC12 .

The relevance to the Arctic is that SRM may be urgently required to slow down the progress of melting. But if we’re too late and the arctic permafrost warms up then GGR will be needed to capture billions of tonnes of atmospheric methane. The scale of the problem is huge, and we’re not well prepared.