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|UN climate conference hears how EO can help|
The role of Earth Observation satellites in combating climate change is being highlighted at the United Nations climate change conference
Thousands of delegates from more than 180 countries are gathered in Bali, Indonesia, to begin negotiations of an international emissions-cutting agreement to succeed the Kyoto Protocol, whose first commitment period ends in 2012.
The Protocol commits its signatories to reduce levels of greenhouse gases – chief among them carbon dioxide – believed to be increasing global warming. Around 25 billion tonnes of extra carbon dioxide is released into the atmosphere annually by human activities, mainly through burning of fossil fuels, land clearance and wildfires. Because deforestation in tropical rainforests accounts for as much as 20 percent of global greenhouse gas emissions, finding ways to curb or halt deforestation is high on the conference’s agenda. One scheme under consideration, called Reduced Emissions from Deforestation in Developing Countries (REDD), involves developed countries offsetting their emissions by paying developing countries for every hectare of forest they do not cut down. In order for the carbon-accounting scheme to work, systematic monitoring of forests is crucial, with tropical deforestation as a major contributor.
Earth Observation (EO) can provide baseline mapping by high resolution optical satellite sensors like Landsat’s Thematic Mapper, Spot’s HR, Terra’s ASTER, IRS-P6’s medium resolution AWIFS, Envisat’s MERIS and Terra’s MODIS instruments, which are the work horses for large area baseline mapping.
Using Envisat’s Advanced Synthetic Aperture Radar (ASAR) sensor, an automated satellite radar monitoring application for deforestation detection has been developed by SarVision, a spin-off of Wageningen University in the Netherlands and the Indonesian Ministry of Forestry.
Envisat is providing a new ASAR acquisition of the same peat land area (6 000 000 hectares) every 35 days – timely enough for local partners to effectively deploy law enforcement or to inform policy makers. Local partners on the ground confirm clearings and burnt areas by regularly targeted field surveys and ultra light aircraft. The change maps, available to users online in Google Earth, are easy to grasp even for an untrained eye.
Remote Sensing Solutions GmbH (RSS) of Germany is also using EO satellites to monitor land cover change and the impact of fires in tropical peat lands and emissions of carbon dioxide emissions caused by peat fires and peat decomposition. The company uses Envisat’s ASAR, in combination with optical sensors, to improve biomass estimates of pristine and degraded forest ecosystems for REDD baseline assessment and monitoring.
According to Professor Florian Siegert, CEO of RSS, the large increase in area of oil palm on peat that is projected to take place in coming years to satisfy the biofuel demand will release much more carbon dioxide emissions than the fossil fuel it is supposed to replace. Rudy Rabbinge, Dean of Wageningen University, expressed concerns at the UNFCCC Forest Day saying it is "unwise to go in big scale on biofuel in developing countries."
Dr Susan Page of the Department of Geography, University of Leicester, involved in the EU-funded CARBOPEAT and RESTORPEAT projects said: "Current land use and land practice developments in Southeast Asia give grave cause for concern. While deforestation rates in non-peatland areas are decreasing slightly owing to depletion of forest resources, those on peatlands have been rising for the last 20 years.
ESA is manning an exhibit throughout the conference to communicate its own Kyoto-supporting services, such as two REDD case studies set up to help policy makers come up with feasible compensation mechanisms for Bolivia and Cameroon.
On Thursday, ESA hosted a special side event, ‘Space supporting UNFCCC - global products for a better understanding of our climate,’ which covered global aspects for monitoring essential climate-variables (ECV) and sought to illustrate EO as a feasible and practical tool for climate change observation. With support from ESA, the Global Observation of Forest and Land Cover Dynamics (GOFC-GOLD) and the Joint Research Centre (JRC) presented their REDD sourcebook providing guidelines for implementation mechanisms.
In the future, even better tools from space to monitor tropical deforestation will be available through the EU-led initiative Global Monitoring for Environment and Security (GMES), which from 2011 will begin launching the Sentinel satellites that will enable operational monitoring.