My biggest concern about climate change
If you could talk to world leaders about climate change, what would you tell them?
It's been 26 years since Nasa climate scientist James Hansen first raised the alarm about global warming.
Since then there have been countless reports issued - but environmentalists and many climate scientists say not nearly enough has been done.
The Intergovernmental Panel on Climate Change says it's "extremely likely" that human beings are the main reason why temperatures have risen since the mid-20th century. Each of the last three decades has been warmer than any preceding decade since 1850 as greenhouse gases have reached levels unseen in at least 800,000 years.
Unless we reduce the levels of carbon dioxide in the atmosphere - and soon - there'll be more deadly heat waves, floods, typhoons, hurricanes, blizzards and droughts around the world, environmentalists warn.
World leaders will be discussing climate change at the Climate Summit at the Union Nations headquarters in New York in September and the United Nations Climate Change Conference in Paris next year.
Do you think our world leaders are doing enough? What would you say to them if you had the chance?
Tell us what you'd tell world leaders, if you had the chance, by clicking on the green button below.
As always, we're looking for submissions of between 300 to 500 words - if you have something short and sweet to say, feel free to submit it as a comment to one of our articles.
View all contributions