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Wind and solar power are the two long-standing alternatives to carbon-based energy but the outlook for both has begun to look a little gloomy with headlines focussed on declining investment and lowering subsidies. In the fifth report of the series on CNBC, Guy Johnson gets a forecast for wind and solar energy.

To see David Hone, Shell’s Climate Change Advisor, introduce this programme, please see here

To see the next episode in this series, please see here