Let's see if an old heat record in Sydney tumbles...could be close.

While carbon dioxide is central to the effort to combat climate change, it's clear that the second biggest contributor - methane - needs a lot more attention. Annual emissions of the potent greenhouse gas have increased ten-fold since 2006, and it's a puzzle to pin down what's caused the jump. Daisy, for now, gets a lot of the blame...

Some intense heat sweeping across southern Australia, with a couple of days in the mid- to high-30s tipped for Sydney. Along the way, there's also some significant drying out of inland regions (and hence a few total fire bans declared):

Malcolm Turnbull opposes the states going their own way on set renewable energy goals (particularly when the federal govt doesn't have one after 2020). GE, the global energy giant, points to the US experience to show there is nothing 'intrinsically bad' about the states setting targets. Indeed, some of the most active in renewables happen to be be 'red states', led by Republicans.

Lightning's spectacular - and as we saw last week in NSW, deadly. And it's likely to get worse with climate change:

John Church, a prominent global figure in sea-level rises, became the face of the CSIRO's attempt to slash climate science. Now he has a new post in Australia. A new report on Greenland reminds us why his work is needed.

Why the trends offer both cheer and fear about the future of clean energy and climate change.

And so the Green Army is going to be demobilised...Seems to fit into the pattern of environmental retreats since 2013.

Here's my view on a few things to look out for in the climate change debate...a live issue that is likely to be with us through 2017...

Would you respond to a heatwave category 3 or higher? Heatwaves cause more deaths in Australia than all other natural hazards combined...but we're still working on the best ways to get that message across.

Sydney's spring was notable most for the lack of cool days...and now we're heating up as summer arrives.

Interesting findings about farmers - yes, climate change is a thing, and more of them are realise they are being affected now:

Like thunderstorms? Fair chance of storms each afternoon in parts of Sydney over the coming week...

Arctic ice is at record lows for this time of year - but so is Antarctica's. While the global warming signal is clear in the north, the story is a bit more complicated - like much else - in the deepest south:

Polars are emblematic about how species are being affected by climate change. Here's though are some of the ways species everywhere are increasingly facing challenges for survival.