I could fly to New York and back every day for seven years and still not leave a carbon footprint as big as if I have a child. Ten thousand tonnes of CO2. That's the weight of the Eiffel Tower. I'd be giving birth to the Eiffel Tower.'

In a time of global anxiety, terrorism, erratic weather and political unrest, a young couple want a child but are running out of time. If they over think it, they'll never do it. But if they rush, it could be a disaster. They want to have a child for the right reasons. Except, what exactly are the right reasons? And what will be the first to destruct – the planet or the relationship?