Whales having to shout mating calls

Whales are renowned for using low-frequency soundwaves to communicate over hundreds of miles, but as the number of most whale species is now less than 5% of their natural level the ability to could be vital to finding mates. Some whales are having to 'shout' up to 10 times louder due to noise pollution from ships engines ,propellers ,sonar and even windfarms which is causing concern that whales could be driven away from the waters off the British Isles. Human noise is doubling every decade so we could see some severe impacts in the future - Pennsylvania State Uni.