What is the tragedy of the commons, and why is this concept relevant for discussions of sustainability?

What were the root causes of the Deep water Horizon oil spill?
Explain the distinction between narrow and broad sustainability, and between weak and strong sustainability.
What is, in your opinion, the best argument for thinking that we have a moral obligation to preserve natural resources such as oil,
minerals, and living seas for future generations?
What claim is the Last Man argument meant to support? Is this a convincing argument?
What is the tragedy of the commons, and why is this concept relevant for discussions of sustainability?
Explain and discuss the lawn crossing example. What, if anything, does this example show?