"Due to land clearing, development and erosion, our soils have been stripped of their natural, beneficial nutrients, " Lesko explains.
The act of clearing land for livestock is one that damages the environments on which people and other life depend.
The European Commission says clearing land in order to plant biofuel crops can often cancel out the environmental benefits of biofuel.
Colombia's vigorous police chief, General Rosso Jose Serrano, argues that the damage caused by farmers clearing land for coca far exceeds any risk from tebuthiuron.
After peace was established, the country faced the challenge of reestablishing civil institutions, rebuilding damaged infrastructure, clearing land mines and demobilizing large numbers of former fighters.
Actress Daryl Hannah was arrested last month in Wood County, Texas, when she and another woman tried to stop a bulldozer from clearing land along the pipeline path.
Clearing land to plant food for biofuel releases the greenhouse gas carbon dioxide (CO2) through ploughing and can involve deforestation, which reduces the "carbon sinks" - the trees that absorb CO2.
Clearing of land for agriculture, logging, and other extractive industries accounts for as much as one third of some countries' total carbon emissions.
But while the presence of humans has been a major factor in increasing deforestation and the clearing of land for farming, the absence of humans can also be a threat to trees.
There was long-running controversy over the cost of clearing the industrial land to make way for the hospital.
Mr Sampson said his teams have been helping with some of the work clearing landslides which started on private land but ended up on public roads.
Developers are clearing an average of 50 acres of tree-covered land per day, which amounts to an area larger than Manhattan each year.
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