Global warming? You may accept or reject those who say it is a dangerous phenomenon. But if the planet is warming, and humanity is contributing to it, shouldn't someone be 1? If the Earth is, in fact, engaged in a long-term warming cycle? And if humanity is partly responsible — 2? Possible solutions to global warming range from the simple to the complex, from changing 3to engineering giant reflectors in space. The most talked about solutions involve expanded use of 4, and less reliance on fossil fuels. Volcanoes, forest fires, ocean and atmospheric variability are 5that change climate conditions. Might nature correct the warming trend itself? Climate scientists say that it seems very unlikely. 6. Science gives us likelihood. We think that it's likely that 7of the last few decades isn't due to the usual causes such as changes 8, changes in the sun, volcanoes, but it's due primarily to humans 9. John Topping of the nonprofit Climate Institute says it will be 10, not governments, coming up with solutions. He argues that we need to 11in the direction of emerging clean energy technologies and part of that's going to happen because we, as consumers, step forward and we are conscious 12to get more energy-efficient products. Higher gas prices are making 13more attractive to consumers. Building and home constructions are becoming more energy efficient. Climate change is 14. But climate change also provides an opportunity for countries 15, and the only way to advance much globally, is to look at approaches that protect the environment at the same time that they 16. Wider application of renewable energy resources could reduce greenhouse gases and 17. Some scientists are suggesting grander solutions, involving 18: building huge sunshades in space, for example, tinkering with clouds to make them 19, perhaps tricking oceans into soaking up 20.