Environmental campaigners Friends of the Earth is planning to send thousands of audio messages to next month's Earth Summit via its new website.
Sounds of a mother crying, a scream of frustration, a clock ticking, a kookaburra calling, a beer bottle opening, the whirr of a chainsaw, a tiger's roar and, er, the sound of silence will be sent from the site to the summit in South Africa.
Radiohead singer Thom Yorke and writer Arundhati Roy will help launch radioearthsummit.org, which aims to show world leaders that action is needed to protect people and the environment from exploitation by global corporations.
Liana Stupples, of Friends of the Earth, said: "We want people to send their messages to world leaders via radioearthsummit but, most of all, we want government leaders around the world to listen to what they have to say and take action to protect the planet."
The site will also provide news, features and interviews in the run-up to the conference, which takes place in Johannesburg from 26 August to 4 September.
Sudden increases in availability of sniper rifles on Vikendi
Antarctica lost on average 252 gigatons of ice mass per year from 2009 to 2017, claims study
Buyers can demand refunds if they've had a game for no more than 14 days and not registered more than two hours of play
Total lunar eclipse 2019: 'Super Blood Wolf Moon' to be visible across Europe and North America on Sunday night
Moon will turn reddish-orange in colour during this weekend's total lunar eclipse