The question makes two explicit assumptions, both of which are controversial and disputed: that climate change is rapid and that it will result in severe upheaval. Similarly, it is not clear whether the best reaction to global warming should be societal, or individual (or, perhaps, global).
That global warming is happening has now been established. Yet, such a forcing is likely to take centuries to induce any discernible climate change on the planetary level. Moreover: self-interested and well-paying hype aside, we know close to nothing about the hypercomplex set of interactions between various greenhouse gases, the atmosphere, the oceans, the Earth's orbit, volcanic eruptions, human activities, the unforeseen outcomes and by-products of well-meaning regulation and technologies (such as biofuels), solar dynamics, plate tectonics, and thousands of other factors, the vast majority of which are yet to be discovered.
Environmentalism is, therefore, poor science or pseudo-science: it is a pernicious and venal form of faddish hubris. In our current state of ignorance, the more ambitious variants of "solutions" such as geoengineering are far more dangerous than the threats of global warming.
Two things are clear, though: (a) Climate change had happened frequently and repeatedly, long before and ever since humans strode the scene; and (b) Some regions of Earth will greatly benefit economically from global warming. Others, inevitably, will suffer and will have to adapt. None of this sounds like a "severe upheaval", let alone life-threatening as the more rabid and sensationalist environmentalists will have us believe.
We should take an inventory of what we know and act upon it resolutely (mitigation): emissions from fossil fuel combustion should be tamed, captured, stored, sunk, and sequestered (aerosols to be further studied in conjunction with global dimming and ozone depletion); measures for population control and family planning enhanced; alternative and renewable fuels should be studied and incentives provided to energy-efficient, clean and green technologies; cement manufacture should be tweaked; cap and trade (or tax) schemes implemented on the national, corporate, and individual levels; weather-resistant, energy-conserving, and green construction technologies pioneered; the diets of livestock should be adapted to restrict biological emissions; deforestation and reforestation should be rationalized as should be land use; drought-related indigenous agricultural and water management knowledge and crop varieties should be preserved; flood defenses erected or strengthened; and weather-monitoring capacity should be extended and modernized. These measures make good sense, whatever the urgency of the problem facing us.
But, we should invest the bulk of our scarce resources in research and innovation. We should accept that climate change is inevitable and work out ways of harnessing it to our benefit. We should come up with new agricultural methods and strains; new types of tourism; new irrigation techniques; water desalination, diversion, transport, and allocation schemes; ways of sustaining biological diversity and of helping the human body adapt and cope; and global plans to cope with energy production problems, poverty, and disease triggered by global warming.
For the next few centuries, global warming is inexorable and largely irreversible (as the IPCC essentially admits). To think otherwise is completely delusional. Better to re-imagine our existence on this planet (adaptation). As temperatures rise in certain locales (and drop in others!), new economic activities and routes of commerce would be made possible or rendered feasible; new types of produce and forests will flourish; new technologies will be developed to cater to a novel and growing set of needs.
We would do well to not consider global warming as a crisis, but as a massive change. And even if we insist on regarding it as a cataclysm, as the Chinese saying goes, there are opportunities in every predicament. The initial costs of every transformation and transition in human history have been steep (recall the Industrial Revolution and, more recently, the transition from Communism to Capitalism). Climate change is not likely to be the only exception. Such a massive realignment implies severe disruption and great distress. But, invariably, tectonic shifts are followed by an extended period of creativity and growth. This time will be no different.
