An important note is that they use a global perspective rather than individual perspective in their solutions. While food is a bigger issue than energy when taking a global perspective, it comes down to the fact that a lot more people eat food than uses energy. For the individual a change in energy will create a bigger impact than a change in diet, assuming the person is using energy in the first place (ie transportation, travel, heating, appliances).

Or to put it in an other word, if we can get the full population of earth to stop eating meat it will do more good than getting the few percentages of the population that benefit from burning fossil fuels to switch to more Eco-friendly alternatives. A single flight with a plane represent quite a few eaten goats of C02 for people living in the poorest places in the world, but there is a lot of people in the world.

As Zen master Thich Nhat Hanh could have said, making the transition to a plant-based diet may be the most effective way an individual can stop climate change as long they already go by bike and don't travel beyond the range of said bike. They should also make sure that heating isn't created through coal, oil, or gas. Heat from burning garbage is an complicated issue, but I suspect it should also be avoided.