Klare's The Race for What's Left is about the end of easy resources. His focus is fossil fuels, land for agriculture, and rare earths.
When we read the news, we should think about nations and corporations attempting to control easy resources now so that they can afford to pay more (when resources are scarce) later. When the Canadian military trains in the Arctic, for example, Canada is spending a resource now to assert its sovereignty. It does this because it plans to cash in on oil and gas reserves under the Arctic. Whenever we see chatter about combatting climate change as well as strategies to cash in on these resources, we're at best seeing an attempt to have it both ways.
More broadly, I read Klare as being in opposition to optimists. In Better Angels of Our Nature, for example, Steven Pinker argues that we have enjoyed a few decades of relative peace in part because the sense that growth was possible incentivized nations to work together. But if resources are running out, as Klare argues here, then we would expect a decline in international cooperation as countries begin battening down the hatches. Interestingly, even if Pinker is right to be optimistic, as he claims to be in Enlightenment Now, just a sense of foreboding taking hold in the general public might be sufficient to give rise to nationalism and xenophobia.
Readers hoping to make the argument for environmental determinism might find this a useful resource.