(CNN)In just the latest reminder of the dangers of pollution in our oceans, a dead whale in Indonesia has been found with 13.2 pounds (six kilograms) of plastic waste in its stomach. "Although we have not been able to deduce the cause of death, the facts that we see are truly awful," said Dwi Suprapti, marine species conservation coordinator at WWF-Indonesia, in a statement to CNN. A 2015 report by Ocean Conservancy and the McKinsey Center for Business and Environment found that over 50% of the plastic leaking into world oceans comes from China, Indonesia, the Philippines, Thailand and Vietnam, suggesting that the two whales died in dangerous waters for marine life.