Meet Big Baby, our 7 m tall baby balloon whose job is to highlight the impact of our numbers on the environment.

Each of us adds to global greenhouse gas emissions and when people choose to have fewer kids, that helps fight climate change.

Even Prince Harry recently declared that he and Meghan Markle would have no more than two kids to protect the environment. 

Chris Packham

"From protecting our forests to changing our diets, as a society and as individuals there are many things we need to do to help avert climate catastrophe. One of those is to have an open, rational conversation about our population and our family sizes. If that takes a giant inflatable baby joining this Friday's climate strike, I'm all for it." 

- PM Patron Chris Packham

Current world population

Big Baby in London

More feet, more heat

With our population now at 7.7 billion people and growing, the strain on nature is greater than ever before. Climate change is widely recognised as the most important threat to humanity today. We need to make many profound changes as individuals and as a society to tackle it. One of those is to recognise the crucial link between increasing emissions and ever more consumers.

In November 2019, more than 11,000 scientists from 153 countries declared a Climate Emergency – in their paper, they call for stabilising and, "ideally", reducing global population via positive means, including removing barriers to family planning, achieving gender equality, and improving education, to avert the worst climate impacts.

A key 2017 study suggested that one of the most effective actions individuals in high-income countries can take to cut their carbon emissions over the long term is to have one fewer child

Big Baby infographic

How much does Big Baby weigh in CO2?

Our Big Baby is filled with helium but if he were filled with CO2, he would have a mass of 60 kg. In the UK, each one of us is responsible for nearly 12 tonnes of CO2 per year - the equivalent of 198 Big Babies!

Please share our Big Baby on social media to help spread the word that small families are key to a more sustainable future. You can download this shareable graphic and copy the example tweet text below. Don't forget to use hashtag #BigBaby!

Choosing to have one fewer child is one of the most powerful #climate actions individuals can take. We need #smallfamilies for a brighter future. #BigBaby www.smallerfamilies.org

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Every month we send an email covering the top stories about how population affects the environment and people's lives - and what's being done to fix it. Keep up with the latest developments, our campaigns, and what you can do, by signing up to our mailing list

Jane Goodall

"The climate crisis that now threatens life on Earth as we know it results from a combination of different human activities, including the pollution of land, air and water, our reckless burning of fossil fuels, the destruction of forests, extreme poverty, and the unsustainable life styles of so many of us.  And all of this is impacted by the relentless growth of human populations and their livestock.  Educating and empowering women and girls and providing family planning information enables more people to choose the size of their families.  And choosing to have fewer children is one of the most important choices we can make."

- PM Patron Dame Jane Goodall

Gregory and daughter

"When we discussed having children, we decided that having just one was the best way to guarantee a sustainable future for our child. Our daughter is now 4 years old and we genuinely feel that this has been the best decision."

- Gregory, father of one

Support our campaigns

Our vision is of a future in which our population co-exists in harmony with nature and prospers on a healthy planet, to the benefit of all. Learn more about our work and how to get involved.