In an op-ed in Saturday’s New York Times, To Save the Planet, Don’t Plant Trees, Nadine Unger argues that reducing deforestation and planting trees won’t help fix climate change but will rather make it worse. One might ask how the 2,000-plus scientists and experts on Intergovernmental Panel on Climate Change (IPPC) got this one wrong – they found tropical deforestation a major source that must be reduced to control climate change – but in fact it’s Unger who’s way out on a limb here.
In tropical forests like the Amazon, where deforestation is happening and thus where the Climate Summit’s attention is focused, trees take up water from rainfall and evaporate it through their leaves, and create cloud cover. These clouds reflect even more sunlight than grasslands or bare earth, thus cooling the earth more. This is why large-scale deforestation disrupts rainfall regimes – and why deforestation in the Amazon, if unchecked, may reduce rainfall in California.
Emissions from tropical deforestation are, from the perspective of the atmosphere, just the same as emissions from burning fossil fuels – carbon that was wood, coal, oil or gas is turned into CO₂ and released to the atmosphere. In a living forest, trees do die and, over time release CO₂ to the atmosphere.
But then new trees grow, and absorb that CO₂ again – not the case when forests that have stored carbon for centuries are replaced by grass to feed cattle or oil palm plantations.
Contrary to Unger’s claims, the “high risk” is to ignore the 200 billion tons of at-risk carbon stocks in the world’s tropical forests. In fact, as the IPCC has concluded, stopping tropical deforestation is a critical priority for controlling climate change.
This post first appeared on EDF Talks Global Climate.