Get ready for a warmer world, Shell says

Solar power and natural gas will grow rapidly in the next few decades, if new scenarios from global energy giant Shell prove accurate.

And as the technology to capture carbon from the burning fossil fuels reaches scale, and sources of clean energy grow, net carbon emissions could drop to zero by 2100.

Even so, it will be hard, if not impossible, to meet the goal set by the world's governments of holding the average increase in global temperatures to 2 degrees centigrade.

In Washington on Thursday, Royal Dutch Shell's chief executive, Peter Voser, and Jeremy Bentham, the head of Shell's scenarios team, unveiled a pair of "New Lens" scenarios, dubbed "oceans" and "mountains," and available in much greater detail here. In essence (and it's more complicated than this), the "mountains" scenario envisions a strong role for government and coordinated global policy, while the "oceans" scenario sees dispersed power, greater volatility, a stronger role for markets and rapid economic growth. Shell has been generating scenarios for about 40 years, to help guide the company's long-term planning as well as influence policy makers.

Underlying both scenarios, though, are assumptions about the world's increasing population and economic growth that together will drive demand for energy by about 80 percent by 2050. That rising demand is all but unavoidable, Bentham said, even assuming strong policies to promote efficiency or high energy prices that discourage consumption.

Meeting that demand for energy, while reducing carbon emissions dramatically, will be extremely difficult, to say the least, the Shell executives said.

"At current trends," Voser said, greenhouse gas emissions "will far exceed what is widely to believed the upper limits for climate change."

Shell's two scenarios generate different energy mixes for the future. The policy-driven "mountains" analysis leads to a shift from oil and coal, which are the world's biggest energy sources today, to natural gas. The company says:

New policies unlock plentiful natural gas resources -- making it the largest global energy source by the 2030s -- and accelerate carbon capture and storage technology, supporting a cleaner energy system.

Next page: Predicting the future