The Earth Day website gives a clue:
‘Our planet is at a turning point. The massive global migration underway now from countryside to cities will demand huge investments in energy, water, materials, waste, food distribution, and transportation over the next 25 years. If the right investments are made now, this unique opportunity will be the catalyst for dramatic changes in the built environment and the fight against carbon emissions and climate change.’
Spot the key phrase?
Yes, it’s ‘massive global migration’. The problem is us. That’s why it’s so important to help people have smaller families, whether that be by improving sex and relationship education, improving family planning provision, improving women’s access to education, employment and social rights or simply by arguing the case against historical family norms. On this Earth Day, April 22nd 2014, whatever else you do, promote smaller families.