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Major observed threats to world's coral reefs. Coral Reef Loss: Determining the Importance of Overfishing and Nutrient Pollution in the Global Decline of Coral Reefs. Coral reef ecosystems are among the most diverse and highly productive ecosystems on the planet yet are currently threatened by a number of natural and human-induced factors.

Coral Reef Loss: Determining the Importance of Overfishing and Nutrient Pollution in the Global Decline of Coral Reefs

Regardless of the cause, reef degradation generally results in an irreversible phase-shift from dominance by reef-building corals to dominance by fleshy macroalgae or seaweed. These shifts are believed to be irreversible and lead to communities that are less diverse and much less complex. While a number of natural disturbances can cause localized coral mortality, reduced top-down control (caused by overfishing) and increased bottom-up control (caused by nutrient pollution) are the most frequently implicated causes of human-induced reef degradation (aside from global warming).

Overfishing and destructive fishing. Coral bleaching. These aerials of Australia's Great Barrier Reef are evidence the most untouched part of it has the most severe bleaching in its history.

Coral bleaching

The footage, which filmed over 500 coral reefs during six days from Cairns to Papua New Guinea, shows 95% is white and yellow. Scientists say the bleaching happens in rising water temperatures – the coral, under stress, drives out living algae, causing it to calcify, and part of that is down to the current El Niño climate cycle. They say unless the World Heritage Site gets a break in the weather conditions within weeks, some coral areas are unlikely to survive.

Causes and Effects of Water Pollution. Water covers 70% of the Earth’s surface and makes up over 60% of the human body.

Causes and Effects of Water Pollution

Water pollution affects marine ecosystems, wildlife health, and human well-being. The answer to solving pollution is to make changes in our daily habits and pay more attention to the types of products we consume. The following lists display causes of water pollution and the effects it has on human health and the environment. Save the Last Living Half of the Great Barrier Reef. Target: Australian Minister for the Environment Greg Hunt Goal: Address rapidly deteriorating health of the Great Barrier Reef.

Save the Last Living Half of the Great Barrier Reef

Half of the world’s largest living ecosystem is “dead or dying” and the entire ecosystem faces extinction according to scientists in one of the grimmest reports on the health of the Great Barrier Reef. The reef has been ravaged by a process known as “bleaching” in which water warms and causes coral to expel the algae living inside of it.

Experts estimate that a staggering 93 percent of the reef has been affected by bleaching. The cause of this crisis is a familiar one–climate change. Stop Carmichael Mine. In the coming days, Environment Minister Greg Hunt will decide whether to allow one of the most reckless companies in the world, Adani, to build a monstrous new mine in Queensland's Galilee Basin.

Stop Carmichael Mine

It’s so massive that it would even require its very own shipping terminal in – of all places – the Great Barrier Reef World Heritage Area. We can still stop this. MaryGarbett1 : The Great Barrier Reef is under ... Fight for the Reef. Take just one minute and send an email to the decision makers telling them it is not ok to dump in any of the Reef's World Heritage waters.

Fight for the Reef

Tell them dumping in sensitive coastal wetlands isn't a solution. Your message: Dear Deputy Premier Jeff Seeney and Minister Greg Hunt, This is a simple message about plans for the Abbot Point port expansion. Coral Reef Loss: Determining the Importance of Overfishing and Nutrient Pollution in the Global Decline of Coral Reefs.