The charity, whose patron is Chris Packham from The Really Wild Show, conducted a survey which found that between 2015 and 2030 the country's population will increase by 5.5 million - that's 10 percent.
And that the world's population will reach a staggering 7.5 billion by 2017.
Smaller families are a key part of solving challenges like climate change and poverty. Help us spread that message https://t.co/2j7trcfiYU— Population Matters (@PopnMatters) January 9, 2017
In a bid to halt the destructive competition between the natural and unnatural world, Chris' charity is calling for the government to address the population boom.
"Climate change and other human impacts on the environment are a threat to us all, in particular younger generations who will live through the worst of their effects," a report released by the charity explained.
"There has never been a more critical time to campaign for smaller family sizes."
The destructive competition we have with nature will continue as long as human numbers are growing. https://t.co/1ZbNgOo52y— Population Matters (@PopnMatters) January 9, 2017
The charity has already met with the ministers responsible for climate change and overseas development.
They also want to bring attention to the impact of population on CO2 emissions and the vital role of family planning.
What do you think?