BBC: The UN sustainable development summit in Rio de Janeiro has formally opened with a warning from UN head Ban Ki-moon that progress on the issue is too slow.
The secretary-general told world leaders and other ministers that “words must translate into action”.
On the summit’s fringes, international finance institutions launched a $175bn fund to boost sustainable transport.
And the UK government announced that major businesses will have to report their carbon emissions from next year.
Mr…

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