Saturday, April 14, 2012
Climate Change - At the Limits
Image courtesy of www.nature.com
Following on from my blog on Resource Scarcity and in preparation for my PCBS which started at Cambridge last week, I have been reading the work of 28 internationally renowned scientists on Planetary Boundaries. This may sound a bit heavy, but please hang in there! It’s taken me a couple of weeks to get my head round the content and will form a total of 3 blogs, but I’m hoping this blog will provide a useful summary.
The planetary boundaries approach focuses on the “services” provided via Earth’s systems. In contrast to other approaches, this approach identifies environmentally safe boundaries within which to operate and accounts for non-linear change due to the crossing of a threshold. Even though the Earth’s “services” are directly linked to human welfare, they are not easily captured in a typical risk assessment.
The work on planetary boundaries is a first step, identifying biophysical boundaries at the planetary scale; (in contrast to piecemeal (or individual) commitments made by individual countries); within which humanity can choose numerous routes to human well-being and development. Katherine Richardson (co-author and one of the 28 scientists) emphasises the huge potential for mankind to be more proactive. The authors highlight the fact that further work will need to focus on the societal dynamics that have led to the current situation and propose ways in which our societies can stay within these boundaries. However, Richardson believes their work presents a framework for use in the societal decision making process.
Crossing the Boundary
Nine global biophysical boundaries were identified, three of which the scientists believe we’ve already crossed. These are climate change, biological diversity and nitrogen input to the biosphere.
In this blog I will address the first of the three boundaries which we have already breached and why I believe we should care. In subsequent blogs I will address the remaining boundaries and their impact.
On climate change, the scientists at the Stockholm Resilience Centre report that we’ve reached a point at which the loss of summer polar ice is almost certainly irreversible. There is melting of almost all mountain glaciers around the world and an increased rate of sea-level rise in the last 10-15 years. The “Carbon Sinks”, like forests, that capture carbon are also reducing. (The area covered by primary forests – those undisturbed by human activity – has fallen by more than 40 million hectares, an area larger than Germany or Japan, since 2000).
An article by Jonathan Amos, Science Correspondent for the BBC reports on a new detailed record of past climate change, (by a Harvard University-led team), that proves the last ice age was ended by a rise in temperature driven by an increase in atmospheric carbon dioxide. The Scientists from the Stockholm Resilience Centre also refer to the four-degree latitude poleward shift of subtropical regions, which contributes to increasing aridity in the Mediterranean region, the southern US, eastern Australia and parts of Africa, the increased bleaching and mortality of coral reefs, driven in part by ocean acidification and rising sea surface temperature, an accelerating rate of sea-level rise in the last 10-15 years and a rise in the number of large floods.
Carbon and ecosystem service-intensive industry sectors such as energy, heavy industry and agriculture are likely to face increasing regulatory and consumer pressures to reduce their impact. At the same time, “clean technologies” such as renewable energy are likely to be among the biggest industries of the future. Consider these figures:
· In 2008, the world’s 3,000 largest public companies by market capitalization were estimated to be causing US$2.15 trillion of environmental damage, equivalent to 7 percent of their combined revenues and 50 percent of their combined earnings
· Predictions of annual output losses from climate change range between one percent per year, if strong and early action is taken, to at least five percent a year if governments fail to act.
· The Carbon Disclosure Project reported this year that companies with a strategic focus on climate change provided investors with approximately double the average total return of the Global 500 from January 2005 to May 2011.
However, it is developing countries and the businesses that operate in them that are most vulnerable to climate change impacts even as their rapid industrialization increases their contribution to global CO2 emissions
· Sea level rises could cause flooding in low-lying coastal areas, displacing “tens to hundreds of millions of people” in places such as Southeast Asia, particularly Bangladesh and Vietnam, and small Caribbean and Pacific islands. It is believed that some of the world’s largest and richest cities, such as Tokyo, New York, London and Shanghai could also be affected. Here's one example of business impact from Toyota, resulting from the floods in Thailand last year.
· The Association of British Insurers suggest that, as a result of an inevitable 2 degrees C temperature change, the average annual insured loss in the UK from inland flooding will increase from £47m to £600m.
The CDP Report highlights that some of the most significant effects in the UK will result from Climate Change elsewhere in the world, in the global supply chain.
I hope you’ve found this useful and look forward to catching up with you next time on the breach of the global biodiversity boundary and its impact.