Walter Jehne, Australian soil microbiologist and climate scientist, gave a series of talks at NorthTec's Te Puna o te Mātauranga Marae. Walter tells us that the hydrological cycle drives 95% of the heat dynamics of the planet. Here are some of the topics covered.

Video start: pedogenesis – the process of soil formation over time.

06:25 - Human degradation of soil and the atmosphere.
12:05 - Climate change and the need for a grass roots regenerative revolution.
16:03 - Is CO2 the cause or a symptom?
20:40 - Solutions, including controlling wild fires and reducing burning of grasslands.
24:00 - CO2 drives 3.8% of the global heat dynamics. The problem of the ocean as a heat and CO2 sink.
27:50 - The role of the hydrological cycle. 95% of the heat dynamics of the planet is driven by water.
31:55 - How we (mis)use water.
39:30 - Impact on water retention by increasing soil carbon to 3% - longevity of green.