20 June 2012 Last updated at 12:27 ET

Rio+20: Progress on Earth issues 'too slow' - UN chief

By Richard Black Environment correspondent, BBC News, Rio de Janeiro

Mr Ban said the world community needed to proceed further down the road

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 Ban opened the session with a reference to the historic Earth Summit held here in Rio 20 years ago, which spawned UN conventions on climate change, biodiversity and desertification, as well as the Agenda 21 blueprint for sustainable development.

"Since then, progress has been too slow - we have not gone far enough down the road," he said.

"We are now in sight of a historic agreement - the world is waiting to see if words will translate into action, as we know they must."

Youth message

Mr Ban's comments suggested that there were still decisions for the estimated 130 heads of state and government, and ministers from other countries, to take here.

However, there has been no indication that any are planning to re-open talks on the agreement that their negotiators concluded on Tuesday, before the high-level talks began.

The opening session also heard from 17-year-old New Zealander Brittany Trilford, who won a competition organised by climate change campaign group tcktcktck to send a message behalf of the world's youth.

Rio summit jargon buster

Use the dropdown for easy-to-understand explanations of key terms:

Access and Benefit Sharing (ABS)

Granting countries the right to gain financially from the exploitation of biological resources discovered on their territory. Aims to prevent biopiracy. Agreement made at the UN CBC meeting in Nagoya, Japan in 2010. Rio+20 will see further discussion particularly of resources from international waters.

Referring to the remaining length of the summit here, she told world leaders: "You have 72 hours to decide the fate of your children - my children - my childrens' children - and I start the clock now.

"Are you here to save face - or are you here to save us?"

The meeting has seen a slew of announcements from financial institutions and business groups on stimulating green development.

Perhaps the most significant came from a group of eight international development banks led by the Asian Development Bank, who are preparing to pump $175bn into sustainable transport schemes over the next decade.

Greenhouse gas emissions from transport are growing faster than from any other economic sector.

The banks calculate that air pollution, congestion, traffic accidents and climate impacts can take 5-10% off a country´s GDP per year.

"This is a game changer for sustainable transport," commented Holger Dalkmann, of the World Resources Institute's center for sustainable transport.

"It will ensure that hundreds of millions of people will have cleaner air, less congested roads, and safer transportation.¨

What is the Rio summit about?

The Rio summit will focus on efforts to reduce poverty, while protecting the environment. This task is made harder as the world's population is expected to rise steeply in the years ahead.
The planet's population could be 15 billion people by 2100. Wealth is also expected to rise but its effect on the environment is unclear.

In the past, more people, with more wealth has meant increased consumption.
Since the last Rio summit in 1992, the
number of people on Earth has gone up by
22%
Seafood consumption has gone up by
32%
Meat by
26%
The average person eats 43 kg of meat a year. In 1992 it was 34 kg.
Source: UNEP, 2011. Figures relate to 2007

While food consumption is rising, there are still large numbers of people who are undernourished.
It is one of the UN's many development goals to halve the number of people who suffer from hunger by 2015.

How able is the planet to meet increasing demand?
In 1960, a little over half the planet's land, forests and
fisheries were needed to meet human consumption.
By the late 1970s, consumption was equal to one planet.
By the first years of this century, one-and-a-half planets
were needed to meet consumption.

This deficit can only be met by the depletion of renewable
resources and increased pollution.

Consumption isn't equal. North Americans and Europeans consume far more resources than are available solely within their borders.

As human populations increase, the number and diversity of birds
and animals is falling.
Decreasing biodiversity undermines the planet's ability to sustain humanity. Its reductions typically affect the poorest the most. These issues are right at the heart of the Rio talks.

Some argue that the planet has limits to the stress its different systems can undergo, beyond which a stable future cannot be guaranteed.
This graphic from the scientist and sustainability expert Johan Rockström suggests those limits have already been broken for climate change, biodiversity and the nitrogen cycle.

previous slide next slide

UK Deputy Prime Minister Nick Clegg used the Rio+20 platform to announce that from next year, companies listed on the main market of the London Stock Exchange will have to report their greenhouse gas emissions annually.

Green groups have been pushing for such a commitment for years, believing it will stimulate concerned consumers, investors and the companies themselves to curb emissions.

"Counting your business costs while hiding your greenhouse gas emissions is a false economy," said Mr Clegg.

"British companies need to reduce their harmful emissions for the benefit of the planet, but many back our plans because being energy efficient makes good business sense too."

Alan McGill, a sustainability partner with consultants PwC, said the move should not come as a surprise to businesses.

"Regulations on emissions reporting will indirectly increase everyone's attention on the issue," he said.

"The reputational risks and impacts of people sharing information quickly and globally cannot be underestimated."

The remainder of the week will see a sequence of set-piece speeches by heads of national delegations, who in most cases - though not in the UK's - are heads of state or heads of government.

However, there is already a palpable feeling in the corridors that the serious business is over.

Follow Richard on Twitter