Because they're at least going to exploit what they believe to be available:

The state-owned Cuban oil company says the country may have more than 20bn barrels of oil in its offshore fields - more than double the previous estimate.

Cubapetroleo's exploration manager said drilling in the offshore wells would begin as early as the middle of 2009.

Such reserves would place Cuba among the top 20 oil producing nations.

Ask the Democrats.

[Crossposted at QandO]