Tag: remote sensing

The price of gold and the loss of forests

“Everything is connected” is something we say so often in ecology that it often loses its meaning. However, this new study published today in the Proceedings of the National Academy of Sciences really exemplifies the real world impact of these connections.

Skyrocketing gold prices, driven mainly by speculators, has spurred an epidemic of illegal mining (and consequently deforestation) in the Peruvian Amazon. These mines are dangerously close to a major river system, increasing the risk of mining pollution entering the Madre de Dios River watershed. Mining and deforestation often go together, as we know very well here in the UP.

Greg Asner and his colleagues used remote sensing imagery to detect these mines and measure deforestation caused by them. The images themselves provide a powerful message. Each hectare lost to mining can support hundreds of tree species, and thousands of animal species which depend upon them. The loss of these forests and risks of pollution are difficult to calculate, and therefore difficult to balance against the fluctuating value of the gold retrieved from the mines.

30 years in the blink of an eye

Time, NASA, USGS and Google have joined forces to create a stunning tool to visualize the extensive change that has occurred on our planet at human hands. Dubbed “Timelapse“, millions of Landsat satellite images from the past 30 years have been joined to allow the user to pan across a landscape and witness deforestation in the Amazon, glacial retreat from climate change, tar sands mining in Alberta, mountaintop removal in West Virginia, and urban sprawl in cities like Shanghai, China and Las Vegas, New Mexico (with the accompanying water withdrawal from Lake Mead).

It is often difficult for us to conceptualize and understand the scale at which our natural resource and land use reconfigures our world, but this tool helps immensely. Take a few minutes to check it out……