There are loads of charities who already do the important work responding to the climate crisis, they might just not call it that. But helping out those in need during a heat wave, caring for native wildlife after a bushfire or providing aid during a climate disaster - a warmer world requires more people lending a hand when they can.
Red Cross - volunteer helping those in need http://www.redcross.org.au/volunteering.aspx
State Emergency Service (SES) - become a volunteer http://www.ses.sa.gov.au/site/join_the_ses.jsp
Here are some tips from WIRES about caring for wildlife in heat waves http://www.wires.org.au/blog/wildlife-susceptible-to-heat
In times of disaster, organisations like this are first to respond and save lives on the ground. Climate change affects those who can least afford it first and worst, so by chipping in we can make sure no one gets left behind.
Got a suggestion of someone who should be on this list? Nominate a charity, email firstname.lastname@example.org