Energy: Why Did Shell Throw in the Towel on the Canadian Oil Sands?

<p>Oil sands are becoming more common in the energy sector, and with the amount of work it takes to clean these sands, it's no wonder the cost is so high. Shell not only dropped out of the Arctic after building up all the hype, but now they're letting go of oil sands projects, citing the company's business structure as the problem.</p> <p>All the while, a "cash crunch" is enveloping the Fab Four in the oil and gas sector, but although these numbers are huge to a layperson, their cash reserves seem to be singing a different tune.</p>