Bill Gates speaks about the challenges facing new climate innovations

Exhchange traded funds are bought and sold like shares, but operate as index-tracking funds, passively following their chosen indices, such as the S&P 500, FTSE 100 and the FTSE All World, plus a vast range of smaller exchanges and commodities, such as gold, silver, copper sugar, coffee and oil.

ETFs have zero upfront fees and annual charges as low as 0.07 per cent a year, which means you get to keep more of your returns, as actively managed funds can charge as much as 1.5 per cent a year.

There are thousands to choose from, with the five biggest providers BlackRock’s iShares range, Vanguard, State Street Global Advisors SPDR ETFs, Deutsche Bank AWM X-trackers and Invesco PowerShares.

Engine: 2.0-litre 4-cylinder turbo hybrid

Transmission: eight-speed automatic

Power: 390bhp

Torque: 400Nm

Price: Dh340,000 ($92,579

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