Wanderlust has claimed the actions of some entrants harm the environment by leaving litter and causing erosion.

BBC: Three Peaks Challenge on Wanderlust endangered list

The 3, 000 reindeer are trampling native plants, causing erosion and endangering king penguins and other local birds by destroying their nests and habitat.

BBC: South Georgia prepares to cull its invasive reindeer

Ethanol mandates are prompting more and more corn to be planted on land that is poorly suited for agriculture, causing erosion and pesticide runoff to infiltrate groundwater and aquifer resources.

FORBES: Biofuels: Fields Of Pipedreams

Experts say much of Florida sits on a system of limestone caverns which are subject to water erosion, causing them to collapse.

BBC: Florida sinkhole: Jeffrey Bush home partially demolished

Meanwhile, the arable land that we do currently have is becoming more damaged, with soil erosion now causing 40 percent of land degradation worldwide, the FAO says.

CNN: All About: Food and the environment

They will default, their currency will lose value, and high inflation will result, causing higher unemployment and a further erosion of their economy.

FORBES: 8 Things That Are Most Likely to Occur!

The decision to continue ignoring the unsustainable path of health care not only had clear negative fiscal implications causing our deficits to soar, it also meant an erosion of health coverage for millions, not just those who were the least advantaged, but for the broad middle class as well.

WHITEHOUSE: VP Biden on Economic Expansion for the Middle Class