Scientists say such rapid melting is no longer surprising given the pace of climate change.
Sixteen teenagers take part in a hackathon to devise ways to combat issues such as light pollution.
Residents in Brentford raise concerns about sewage flowing into the local canal network.
Experts have warned the risk of wildfires could double within the next 50 years.
Baroness Brown says there must be better training and planning, after a record year for wildfires in England and Wales.
Aviva boss Amanda Blanc said England was "for sure" building homes that might be uninsurable at some point in the future.
Experts warn England's roads are built for cold weather rather than heatwaves.
More than 77,000 butterflies were recorded in Devon while 47,000 were spotted in Cornwall this July.
Climate change is transforming Papua's snowy peaks, which hold scientific value and spiritual significance.
