Dr Ailie joins Dr Shane and three guests in the studio.

In news - SpaceX successfully land a rocket on a barge in the ocean. See level rise caused by human activity won't peak for at least one millennium. First guest is Dr Tatiana Soares da Costa an NHMRC Early Career Fellow in Biochemistry from La Trobe Institute for Molecular Science, La Trobe University. Tatiana's overall research focus is in the development of new classes of antibiotics and herbicides. Her main focus is the first enzyme in an unchartered pathway. By inhibiting this enzyme, she is able to shut down the entire pathway in bacteria and plants. Tatiana is in the process testing the efficacy against drug-resistant bacteria and weeds.

Second guest is Ravi Ravitharan, Director, Institute of Railway Technology, Monash University.From 2016 a specially-equipped standard railcar will be rocking and rolling along the tracks of East Java. It will have carefully positioned sensors to detect its movement. Railcar instrumentation has been designed by Monash University's Institute of Rail Technology (IRT) to provide data on the condition of the track and the response of the rolling stock. This will allow engineers to accurately estimate safe loads and running speeds, to see whether it's possible to reactivate inactive railways.

Final guest is Amanda McKenzie, Climate Council CEO.GLOBAL emissions have flatlined for the second year in a row as Australia's emissions continue to climb.Renewable energy is powering the decoupling of greenhouse gas emissions from economy growth.We are now reaping the rewards of countries like the US, Germany and China who working hard to tackle climate change but we'd be making even greater progress if countries like Australia started doing their fair share.