Sorry to burst your bubble Ralph, but Ms. Goodall is 100% right on everything she said.
Currently 1000 million acres of land in the USA is used for meat/animal production. That includes grazing, feed lots and all the land used to grow food for animals that are going to be eaten. By contrast, 3,000,000 acres is used to grow plants for human consumption.
To grow one pound of beef requires around 3000 gallons of water, compared to 25 gallons of water to grow a pound of wheat.
Then there's the tonnes of pesticides and herbicides used on the millions of acres of animal foods and the thousands of pounds of antibiotics used on all those animals, all of which is finding it's way into the water table, rivers, lakes and oceans of the world! I have a link to a study that says that a veg diet is more sustainable for the billions of people that will be on this planet in the next 30 years, than is a meat inclusive one. Taking into consideration, the pollution, the waste of resources and the toxic mess of pesticides, herbicides and antibiotics, and the results of overfishing, meat consumption is a decision to participate in the more rapid destruction of the environment.
There was a study by the FAOO back in 2006 that found that meat consumption is the source of 18% of GHG but there was a followup study by another group that put that figure at more like 51%. This factors in not only direct 'cow' methane, but the emissions of the equipment used to plant and harvest their food, transportation costs to slaughterhouses, as well as slaughterhouse costs, transport again to the store and your transportation costs. I can't be sure, but the second study may have included the costs of clearing land of the trees growing on it prior to it becoming 'farm' land. But whatever, even 18% for 'one item' shows that this 'luxury' is costing us.
As well, it is a bomb dropped into a world of biodiversity and it takes out other animals by sheer force of numbers and humans driven to protect their investments. One of the primary proponents of wolf destruction for example is ranchers. Then there is the loss of habitat because of land clearing for grazing and animal food production which affects every species and in the oceans, the by-catch that dies for nothing is also hurting the world beneath the waves.
I would also venture a guess that except for a few people with some specific digestive health issues, nobody really needs meat. If vegan athletes can be at the top of the pack, then there is the best proof that for an average person, it is entirely possible to live well without meat. In my opinion what may have happened millions of years ago is neither here no there. We're living in 2015, now we have the understanding and technology to thrive on a vegetarian diet and the planet cannot sustain what we're doing. Keep in mind, that by 2050 I think it is, the estimates are that there will be another 2 billion people on the planet.
And then there's the issue of the horrendous suffering as a billion animals a year (in the USA) go through the (dis)assembly line.....................
She was also right about my countries lousy record on conservation, not to mention food animal welfare standards. I found a comparison of our standards compared to the EU and we are failing dreadfully.