Coping with Change
From the sands of the Sahel to financial trading floors, individuals, businesses, nonprofits and governments are sizing up climate change – and adjusting their activities accordingly.
By David Biello
The view from space offers a clarity about our changing planet less visible from the ground: spring thaw coming sooner year after year, the iconic snows of Kilimanjaro and glaciers across the globe dwindling – and a great green wall of vegetation spreading across the region just south of Africa’s Sahara Desert.
This arid expanse, known as the Sahel, stretches from the Atlantic Ocean to the Red Sea. It has undergone a remarkable transformation since farmers in nations across the region began to allow trees to grow amidst their crops.
In some places it was by accident, as seeds sprouted from manure spread as fertilizer in Niger. In others it was by design, such as the "green dam" against the desert started in Algeria in 1971. But the result has been the same: improved harvests of millet, sorghum and other staple crops in a region gripped by perennial drought.
Such "agroforestry" boosts yields by returning vital nutrients to the soil in the form of decaying leaves, shading crops from the harshest sun, and recharging underground water reserves. The trees also provide an additional source of income: wood for fires and construction. And they have another even more important benefit: They may help some of the poorest farmers in the world adapt to climate change – while potentially removing as much as 50 billion metric tons of carbon dioxide from the atmosphere, according to agronomist Dennis Garrity, head of the Nairobi-based World Agroforestry Centre.
"The transformation of agriculture into agroforestry is well underway," Garrity says. "Agricultural systems incorporating trees increase overall productivity and incomes in the face of more frequent droughts, and agroforestry systems provide much greater carbon offset opportunities than any other climate mitigation practice in agriculture."
Climate change is already worse than anticipated by the U.N. Intergovernmental Panel on Climate Change. Extreme precipitation events, such as last spring’s flooding in Nashville, Tenn., or last winter’s drought in China, have become more frequent. Sea ice extents have reached record lows in the Arctic. And 2010 marked the end of the hottest decade in recorded history.
Not only that, but the 0.7-degree-Celsius uptick in global average temperatures we’ve seen so far is only half the warming that can be expected from the concentrations of greenhouse gases already in the atmosphere, according to a 2010 report from the U.S. National Research Council. And as warming continues, according to the NRC report, the world can expect (among other things) a drop in the yield of cereal crops due to higher temperatures, an increase in heavy rainfall and a rise in ocean levels.
In other words, whatever measures might be adopted to reduce emissions of greenhouse gases, the world will still need to adapt to a changing climate. Indeed, that process has already begun.
The Carteret Islands in the far southwestern Pacific are not on most maps of the Earth, too small to merit inclusion at just 1 square kilometer of total land mass spread among a cluster of coral atolls. But they just might make it big in the history books – as the (former) home of the world's first true climate refugees.
"The Carterets lie in a circular reef infringed by many reefs in a lagoon, very beautiful but going down really fast through shorelines degradation," reports Ursula Rakova, a local resident. "Over the last 20 years, [the] Carterets have been experiencing rising sea levels, and our chiefs got together and initiated an organization which could fast-track our relocation."
One of the most significant outcomes of last winter’s climate change conference in Cancun was a roadmap for helping developing countries cope with climate change. Read the article.
As global temperatures rise, urban temperatures are rising even faster due to heat-radiating roads, parking lots and rooftops. What can we do to counteract this potentially life-threatening “heat island” effect? IonE researchers are studying 100 of the world’s biggest cities to learn what contributes to urban heating, and what we might do to counteract it. Read the article.
The insurance industry is among those that stand to feel the impact most as greenhouse gases alter global climate. Read what some companies are doing to assess and mitigate climate change risks. Read the article.
In an interview with Momentum, Maldivian president Mohamed Nasheed talks about how his low-lying nation is preparing for the rising waters of climate change. Read the article.
Some residents of the Carterets have moved to higher shores, anticipating that rising waters will eventually obliterate the islands.
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Last modified on January 23, 2012