 A oedda'n 1,3 bilion cwbiti yn ymdau, y oesodol yw'n eu syniadau syniadau. Y cyfnod yn 1 oed o'i dweud y byd yn y rhan, yn gyfnod o hyfodd microscopic algaeth i ymdau'n cyfnod o'r oesodol. Y oesodol bydd yn dweud o'r oeddur oedd ffawr, yn cyfnod o'r oeddod, yn cyfnod o'r oeddod o'r oeddod, ein bod yn dechrau bach o'i bach o bach o'r oeddol yn y ffawr o'i bach o'r oeddod o'i ddau, Half of the oceans by area are what we call the high seas. It's a global commons. Myrhylibarum or freedom of the seas means that fishing and cargo vessels have the freedom to move wherever they want across the oceans. Marine life also moves wherever it wants. It ignores the lines that we draw on maps. As the demand for resources is increasing we're turning to the oceans more and more for things like pharmaceuticals, minerals and energy. This is a piece of copper ore from a deep-sea hydrothermal vent in the Antarctic from a depth of 2,000 metres. Blue growth is really on the agenda. Wherever I go in the oceans, I see impacts from humankind. Whether it's impacts from fishing, plastics, or other forms of pollution, we see it everywhere. This is a fisherman's glove on a seamount 1500 miles from land at a depth of 700 metres. Ac yna o'r gweithio'r gyda'r bysgol peirloedd gwahanol, ac yn cael ei gwasanaeth, a'r cyfrifiadau sydd i'r cyfrifiadau yn cyfrifiadau sydd wedi'i gwahanol sydd yn ei wneud cyfwyrdd, a'r gwahanol yn cael ei gwasanaeth, sy'n ei bodai'r cyfrifiadau. Gweithio'r cyfrifiadau yma er mwyn i'rhewch yn gwahanol i'r byd i'r gyfrifiadau a'r cwm o'r gwahanol. Mae sydd wedi atniwch gan un hanes, a fy boats iawnrach yr oedd o'ch gymhraithddau ar gael ddeganol, maen nhw, o gyrfod hwnnw, y gyrsgawl senodol yn rcos iddyn nhw. Fylltwch yn rhywbeth yn ei hwniadau, fel Y Tynanydol. Roedd yma eich meddor Llywodraeth y Tynaniaed yng Ngharir Llywodraeth yn ystod yma i ymddangos hwnnw. Felly mae'r cynydd yn mynd ddim yn fawr yn y ddechrau i fod yn y ddechrau versus things like food security for the majority. So this really brings to mind some of the problems we have. Something like 20% of all the fish caught in the oceans are caught illegally. Here you can see the crew of an illegal fishing vessel actually painting out the name of the vessel and running up a new flag right under the nose of the Australian Navy. That the simple rules like this can prevent the vessel from being arrested shows how weak the governance is. But technology is improving our ability to deal with things like illegal fishing. Synthetic aperture radar on satellites enables us to see fishing vessels wherever they are on Earth and to actually tell us what they're doing so whether they're fishing or transshipping fish. New technology is also enabling us to exploit new resources in the oceans. This is a deep sea mining machine being built in the UK to exploit hydrothermal minerals from a depth of 1,600 metres of Papua New Guinea. New technology is also enabling us to explore the oceans in ways we haven't been able to. So at a depth of 4,000 metres we've only actually visited about 0.00001% of the oceans. For new technology such as the robot I used to take this photograph really enables us to get at all of these places. And we're learning new things about the way in which life actually structures marine ecosystems. The diving activity of toothed whales, for example, stirs the oceans with the equivalent effect of the whole of the Hawaiian island chain. And this brings nutrients up to the water surface, stimulating primary production. This technology enables us to find these hydrothermal vents in 2010, the first found in the Antarctic. And the description of the biological communities around these changed our ideas about how these communities were organised globally. Simply put, the more we know about the oceans the better we can manage it. We are making progress. This is an illegal tuna fishing vessel that was plundering the waters of Liberia. And an NGO sponsored project called Fish Eye Africa actually helped African states to get together and bring this vessel to book. Overexploitation of the oceans resources directly impacts people. It affects their food security, it affects their livelihoods. We're seeing increased capacity to exploit the oceans but also to manage it as well. So we've got to ask how we move the oceans from decline to recovery. And we have to do this at both the international level, think about things like new implementing agreements for UN Conventional Law of the Seas, but also even on the level of what we do ourselves as individuals.