Saturday's global Live Earth event will see major concerts take place at nine locations around the world.
The concert at London's Wembley Stadium is expected to be one of the focal points, attracting some of the world's musical superstars including Madonna.
BBC correspondents from other cities putting on shows report on what is expected from the gigs, giving a taste of how each event aims to raise environmental awareness.
TOKYO - CHRIS HOGG
Tokyo's Live Earth show will be headlined by the US nu-metal band Linkin Park, who have already pledged to plant a tree for each person who attends their gigs on their upcoming tour.
Linkin Park will headline the Tokyo leg of Live Earth
There will be two concerts in Japan, one at the Makuhari Messe, a cavernous venue on the outskirts of Tokyo, the other at the Toji temple in Kyoto - the city that gave its name to the agreement to try to reduce global greenhouse gases.
A Japanese act, the Yellow Magic Orchestra is headlining there. Also on the bill at the Tokyo gig is Rihanna, currently riding high in the British charts. Japanese acts include Kumi Koda, Ai Otsuka, Rize and Ayaka.
To try to reduce the environmental impact of the gig the organisers say people will be asked to separate their rubbish into nine different categories to maximise the potential for recycling while trees will be planted to offset the carbon impact of the event.
HAMBURG - STEVE ROSENBERG
Hamburg has been trying hard to promote its Live Earth event.
In the run up to the big day, cinemas have been offering free tickets to Al Gore's documentary about climate change - An Inconvenient Truth - and local nightclubs have donated some of their takings to Live Earth.
But ticket sales for the concert itself have been disappointing, resulting in a last-minute push to make sure the concert venue - Hamburg's football stadium - will be full on Saturday.
Topping the bill are Shakira, Enrique Iglesias and Yusuf Islam, formerly known as Cat Stevens.
SYDNEY - NICK BRYANT
Live Earth bursts into life in a country whose government has not only stubbornly refused to sign the Kyoto protocol, but which has been openly critical of Al Gore's attempts to highlight the issue of global warming.
Film actress Toni Collette will appear in her guise as a musician
So the performers at Aussie Stadium in Sydney will be directing their message at the government in Canberra as much as the rest of the world.
They include Crowded House, Jack Johnson, Wolfmother, John Butler Trio, Missy Higgins, Eskimo Joe, Sneaky Sound System, Paul Kelly, Ghostwriters, film star Toni Collette and her band The Finish.
Also look out for singer-turned-politician Peter Garrett, the former lead singer of Midnight Oil, who is now the opposition Labor Party's high-profile environment spokesman.
JOHANNESBURG - PETER BILES
Live Earth SA may be part of a global series of concerts, but the Johannesburg event has generated little publicity so far.
Nonetheless, there is a top-class line-up of internationally-known artists performing here on Saturday, including Joss Stone, UB40, Angelique Kidjo, Vusi Mahlasela and the Soweto Gospel Choir.
Benin singer Angelique Kijdo will bring an African flavour to the event
The event was to have been staged at the Cradle of Humankind, a World Heritage Site, but for logistical reasons, it has been moved to a stadium closer to Johannesburg.
The organisers say this will mean a larger audience and reduce the carbon output created by getting there.
But the South African government still has a long way to go in raising public awareness of climate change and global warming.
RIO DE JANEIRO - GARY DUFFY
There can be few more spectacular venues in the world for an outdoor concert than the famed Copacabana beach in Rio de Janeiro.
In February 2006 the Rolling Stones held a gig here that attracted more than a million people. The stage was the height of a seven-storey building.
More than a million people saw the Stones at Copacabana beach
So no pressure on Live Earth, then.
Brazil is the only country hosting a concert in this worldwide event entirely for free, and the organisers are hoping for a big turnout.
And of course as home to the Amazon, one of the greatest ecosystems and forests on the planet, Brazil's place in the climate change debate, and in Live Earth, is undoubtedly central.
The event is supported by a wide range of Brazilian environmental organisations, including groups set up to defend the Amazon and to oppose deforestation.
Headline acts will include Pharrell Williams, Lenny Kravitz and Macy Gray.
A Brazilian flavour to the party will be given by among others, the eclectic combination of children's television star Xuxa, and Rio-born singer Jorge Ben Jor, whose first single Mas Que Nada was recently covered by the Black Eye Peas with Sergio Mendes.
The song became a massive hit after it was used in a TV advertising campaign during the 2006 World Cup.
So if it does all goes to plan, it should be quite a beach party.
SHANGHAI - DANIEL GRIFFITHS
Live Earth is coming to Shanghai - but so far China's most glitzy, glamorous city is not getting terribly excited.
There's been little publicity and many locals are complaining that the ticket prices are too high.
The line up is largely made up of Chinese acts - Hong Kong legend Eason Chan is the biggest name. But he's the only one with real superstar status.
The lack of interest here will be a disappointment for the organisers.
Thanks to its booming economy, China is one of the world's largest emitters of greenhouse gases.
To tackle climate change the world needs countries like China on board.
But interest in green issues is still a low priority for most people here. A good job, home and car are what matters to many.
And concerts like this one aren't going to change that mindset.
NEW JERSEY - JAMES COOMARASAMY
It's only a couple of days before the event, but I don't have a sense that there's much of a buzz about it here in the States.
Not yet, at least. If there's been an advertising blitz, I haven't noticed one - tickets are still available and most people you ask don't seem aware of the concert.
That will probably change now that Al Gore - the man who inspired it all - is doing the interview circuit.
He has undoubtedly done much to raise the profile of climate change issues in the US, but you do have to wonder how the crowds will compare with 2005's free Live 8 concert, given ticket prices of $55.
Still - the New Jersey (not New York - the Jersey-ites aren't too happy that the distinction isn't being made) line-up - featuring the reformed Police and Smashing Pumpkins, seems a bit of an improvement on the Philadelphia concert of two years ago.
I was there and I soon lost count of the people who asked me why I wasn't in London, where it was all happening.