Common sense was an early loser in the scorching battle over the reality of man-made global warming. For nearly 20 years, one group of activists argued - in the face of ever-mounting evidence - that global warming was a fabrication. Their opponents, meanwhile, exaggerated the phenomenons likely impact - and, as a consequence, dogmatically fixated on drastic, short-term carbon cuts as the only solution, despite overwhelming evidence that such cuts would be cripplingly expensive and woefully ineffective. This scientific pie fight, characterized by name-calling, ignoble tactics, and intellectual intransigence on both sides, not only left the public confused and scared; it undermined the efforts of the most important organizations working on advancing the science of climate change. Almost inevitably, at international summits from Kyoto to Copenhagen, governments failed to take meaningful action on global warming. Fortunately, there finally seems to be a growing number of influential scientists, economists, and politicians who represent a more sensible approach to the issue. As I argued in my 2007 book Cool It, the most rational response to global warming is to make alternative energy technologies so cheap that the whole world can afford them. This requires a deliberate and significant boost to research and development spending. Based on recent work by Isabel Galiana and Chris Green of McGill University, I advocate expenditure totaling around 0.2 percent of global GDP - roughly $100 billion a year. Of course, no fix to global warming will work overnight. So we need to focus more on adapting to the effects of global warming - for example, by stepping up efforts to cope with inland flooding and the urban heat island effect. At the same time, we should explore the practicality of climate engineering, which we may need to buy more time for a smooth transition away from fossil fuels. Acknowledging that man-made climate change is real, but arguing that carbon cuts are not the answer, amounts to staking out a middle ground in the global warming debate - which means being attacked from both sides. For so-called alarmists, pointing out whats wrong with drastic carbon cuts is tantamount to denying the reality of climate change, while so-called deniers lambast anyone who accepts the scientific evidence supporting this mythical problem. Nevertheless, there are encouraging signs that the minority of sensible voices in this debate are beginning to get the attention they deserve. In mid-2009, as part of a project by the Copenhagen Consensus Center to assess different responses to global warming, Green and Galiana performed a cost-benefit analysis of R&D spending on green technologies. Green, a long-time proponent of a technology-led response to global warming, demonstrated the effectiveness of a policy of government investment in R&D aimed at developing new low-carbon technologies, making current technologies cheaper and more effective, and expanding energy-related infrastructure such as smart grids. As Green and Galiana bluntly noted, No approach to climate stabilization will work without an energy technology revolution. Another academic who has advocated a smarter response to global warming is the University of Colorados Roger Pielke, Jr., author of this years must-read global-warming book The Climate Fix. Along with Green, Pielke was one of 14 noted academics who co-wrote Februarys Hartwell Paper, commissioned by the London School of Economics and the University of Oxford. The paper argued for developing alternatives to fossil fuels, ensuring that economic development doesnt wreak environmental havoc, and recognizing the importance of adaptation to climate change. In the US, we witnessed an equally promising development in the climate debate last month, when the conservative American Enterprise Institute, the liberal Brookings Institution, and the centrist Breakthrough Institute published a report that called for revamping Americas energy system with the aim of making clean energy cheap. Entitled Post-Partisan Power, the report comprehensively and convincingly argued that the US government should invest roughly $25 billion per year (about 0.2 percent of Americas GDP) in low-carbon military procurement, R&D, and a new network of university-private sector innovation hubs to create an energy revolution. This sensible proposal predictably drew fire from committed alarmists and deniers. But, promisingly - and surprisingly, given the toxic state of US politics - it attracted support and intelligent commentary from many mainstream pundits. Adding to the voices, in November a documentary based on Cool It will come out in the US. It is too early to suggest that politicians might make real progress toward implementing genuinely effective policies on climate change. But, given the dearth of common sense in recent years, the mere fact that a growing chorus of reasonable voices can now be heard is nothing short of miraculous. The writer is the author of The Skeptical Environmentalist and Cool It, Director of the Copenhagen Consensus Centre, and professor at Copenhagen Business School The Daily Star, Lebanon