Climate in crisis
b'
Pledges to reduce greenhouse gas emissions are largely unachievable says a major audit of commitments to the Paris Climate Accord. Air pollution in Delhi is so bad, breathing the toxic particles has been likened to smoking. Can a scientific assessment of the multiple causes help provide a way forward? We examine a new way of making new plastic \\u2013 from old plastic. And why sending some stem cells to the international space station might help astronauts travel further. \\nWe\\u2019re all familiar with the sensation of sleepiness \\u2013 heavy eye-lid, that warm, fuzzy feeling. But, one listener wants to know, what\\u2019s actually going on in our body and brain when tiredness takes over?
We investigate how our psycho-motor skills are affected by fatigue in a driving simulator. And we ask how does sleepiness change with age? Why, when tired, do adults crave a nap but children become ever more excitable? And what the hell\\u2019s going on with teenagers? We have some answers.
(Image: Tourists wearing masks to protect themselves from smog in New Delhi, India. Credit: Sushil Kumar/Hindustan Times via Getty Images)
'