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Showing posts from August, 2018

Back to the Future ‘Hothouse’

Our current global warming target and the trajectory it places us on, towards a future ‘Hothouse Earth’, has been the subject of much recent discussion, stimulated by a paper by Will Steffen and colleagues .  In many respects, the key contribution of this paper and similar work is to extend the temporal framing of our climate discussions, beyond 2100 for several centuries or more.  Analogously, it is useful to extend our perspective backwards to similar time periods, to reflect on the last time Earth experienced such a Hothouse state and what it means. The Steffen et al paper allows for a variety of framings, all related to the range of natural physical, biological and chemical feedbacks that will amplify or mitigate the human intervention in climate.  [Note: the authors frame their paper around the concept of a limited number of steady state scenarios/temperatures for the Earth.  They then argue that aiming for 2C, potentially an unstable state, could trigger feedbacks tipping

Belo Monte: there is nothing green or sustainable about these mega-dams

Google Maps There are few dams in the world that capture the imagination as much as Belo Monte, built on the “Big Bend” of the Xingu river in the Brazilian Amazon. Its construction has involved an army of 25,000 workers working round the clock since 2011 to excavate over 240m cubic metres of soil and rock, pour three million cubic metres of concrete , and divert 80% of the river’s flow through 24 turbines. The dam is located about 200km before the 1,640km Xingu meets the Amazon.   kmusser ,  CC BY-SA Costing R$30 billion (£5.8 billion), Belo Monte is important not only for the scale of its construction but also the scope of opposition to it. The project was first proposed in the 1970s, and ever since then, local indigenous communities, civil society and even  global   celebrities  have engaged in numerous acts of  direct  and  indirect  action against it. While previous incarnations had been cancelled, Belo Monte is now in the final stages of

Will July’s heat become the new normal?

Saddleworth Moor fire near Stalybridge, England, 2018.  Image credit: NASA For the past month, Europe has experienced a significant heatwave, with both high temperatures and low levels of rainfall, especially in the North. Over this period, we’ve seen a rise in heat-related deaths in major cities, wildfires in Greece, Spain and Portugal, and a distinct ‘browning’ of the European landscape visible from space. As we sit sweltering in our offices, the question on everyone’s lips seems to be “are we going to keep experiencing heatwaves like this as the climate changes?” or, to put it another way, “Is this heat the new norm?” Leo Hickman, Ed Hawkins, and others, have spurred a great deal of social media interest with posts highlighting how climate events that are currently considered ‘extreme’, will at some point be called ‘typical’ as the climate evolves. In January 2007, the BBC aired a special programme presented by Sir David Attenborough called "Climate Change - Brita

Cities’ contributions to the global SDGs: A Bristol view

Earlier this month, people from around the globe gathered in New York for the annual review of the world’s progress towards achieving the UN Sustainable Development Goals (SDGs), an event known as the ‘High Level Political Forum’ (HLPF). These globally-agreed goals were developed in 2015, providing a vision for what the world should look like in 2030. Covering all three dimensions of sustainability through 17 Goals, 169 targets and 244 indicators, the SDGs have been called ‘the closest thing the world has to a strategy’. This year the HLPF focused on 6 of these Goals, including sustainable cities and communities, SDG 11. The inclusion of cities as a specific goal is a success, and it is the first time that a subnational unit has been included in a UN statistical reporting framework. But cities have an important role to play in meeting all of the Goals, beyond just SDG11. Urbanisation is increasingly seen as a key cross cutting element in almost every aspect of sustainable devel