We wrote about this last summer when two key papers were published almost simultaneously. Together they raised big questions about the future of human fertility.
At the first climate talks of the Trump era, a coalition of developing countries, with China at its centre, won small but significant victories.
The UN negotiations in Bonn lay the groundwork for implementing the landmark Paris deal, but tough decisions lay ahead.
Letter sent to US House and Senate committees calls for "coordinated research" to protect communities from toxic stain repellant and firefighting chemicals