<div dir="ltr"><h1><font>University of York bio on the lecturer:</font><br></h1><p><a href="http://www.york.ac.uk/environment/our-staff/callum-roberts/">http://www.york.ac.uk/environment/our-staff/callum-roberts/</a></p><p>
---------------------<br></p><h1><font>This lecture can be listened to off the following website:</font></h1><h1><font><a href="http://www.abc.net.au/radionational/programs/scienceshow/the-coming-crisis-for-the--oceans/4735314">http://www.abc.net.au/radionational/programs/scienceshow/the-coming-crisis-for-the--oceans/4735314</a></font><br>
</h1><h1>The coming crisis for the oceans</h1><p>Saturday 22 June 2013 12:05PM <br></p><p>The world’s oceans are getting hotter, higher, more acidic, and more
polluted. On one hand it’s happening slowly. On the other hand it’s
fast. Incredibly fast. The oceans have warmed more than half a degree in
fifty years. Corals don’t like hot water. They expel their symbiotic
algae resulting in bleaching, and coral death. The oceans are 30% more
acidic compared with pre-industrial times. Animals with shells will
struggle and disappear with the changed water chemistry. And so will the
fish that feed upon them.<br><br>Fish are fleeing the heat. They are
moving polewards. This is leading to loss of diversity in tropical
waters, and increased competition in polar waters. The warmer water
reduces productivity and rates of growth. This is happening as we expect
to take more from the sea for a human population not expected to peak
until mid-century.<br><br>In this address given at the University of
Sydney in 2013, Callum Roberts describes the pressures on the world’s
oceans and their ominous future. He says the world’s oceans have changed
more in the past thirty years than during the whole of human history. <br></p><p>------------------------------------------</p><p>Vision2020 Post: Ted Moffett<br></p></div>