The gardens, established by the river by Governor Gipps in 1846, have celebrations and surprises in store for visitors this year

Bitcoin provokes intense debate but one thing everyone agrees on is that it has become a staggering producer of climate wrecking carbon dioxide.

When Steve Douglas drove by a neighbourhood street corner, he spotted a new and rare species of eucalyptus tree. After 25 years, more than a hundred of these trees are being planted in a secret location in a national park.

The upper house has rejected the scheme to license irrigators’ extraction during floods while a federal agency has dismissed the government’s river plans.

Shy dugongs, sea turtles and ancient microbes are all found among our seagrasses and mangroves. Why are politicians interested in these ocean meadows now?