Consultant geologist Dr Geoff Derrick was invited to present this talk to a conference held in Brisbane at the Pullman Hotel, 22-23 July 2019. The conference was organised and hosted by DANA, a New Zealand-based group of Forest Industry Advisors. The conference was titled “Innovations in the Australian Forest Industry Sector”, and featured 2 days of lectures and workshop discussion, followed by a half-day field trip to Woodchip export facilities at the Port of Brisbane. Continue reading “HUMAN-INDUCED CLIMATE CHANGE – A Geoscientist’s View”
By Jim Steele. Published in Pacifica. Tribune August 20, 2019
There are too many fear mongering politicians pushing an “existential climate crisis”. I find the climate history told by the trees far more trustworthy, and the trees are whispering there is no crisis.
This summer I taught a class on the Natural History of the Sierra Nevada for San Francisco State University’s Sierra Nevada Field Campus. The first day we taught students how to identify the trees. Once students know their trees, they can easily see how tree species vary with elevation, temperature, moisture, and snow pack. They can see which species colonize open sunny areas and which trees need shade before they can invade. Old time naturalists used trees to identify “life-zones” where different species of mammals, birds, insects and other plants can be found. Furthermore, when you listen to the trees, you can see change.
The class explored forests along the North Yuba River. Free from politics, trees tell us about changes in fire frequency, logging, climate change and ecosystem resilience. Photographs taken during the late 1800s during California’s gold rush days, revealed the total devastation of local forests. Gold miners needed wood for heating and cooking, for their metal forges, and for timbers to reinforce their mines. They needed wood to build flume boxes that altered river courses to expose riverbeds. Flume boxes also carried water from high to low elevations where giant water cannons completely washed away hillsides in their search for gold.
By Dr D Weston Allen (MBBS, FRACGP) Aug 2019
Earth’s complex climate is always changing, sometimes rapidly. Greenland’s temperature rose ten degrees Celsius (10⁰C) in a single decade 11,500 years ago. Earth has been warmer than now and the atmospheric carbon dioxide (CO2) level much higher than now for most of its 4.5 billion years. Natural sequestration over 200 million years reduced it ten-fold from 2,000 parts per million (ppm) to just 200ppm 2.58 million years ago when Earth entered the cold Quaternary ice-age.
Continue reading “Tackling Climate Change”
By Steve Goreham. Originally published in NewsBlaze.
Last month, 74 US medical and public health groups released a “U.S. Call to Action,” declaring climate change a “true public health emergency” that can be solved by “urgent action.” The statement calls for a transition away from hydrocarbon energy and a move to a low-carbon economy. But actual weather and health trends don’t support either the alarm or the demanded actions.
The statement was endorsed by the American Medical Association, the American Heart Association, and the American College of Physicians. These and other organizations pronounced climate change the “greatest public health challenge of the 21st century.”
If you wonder where today’s temperature fits in with the grand scheme of time on Earth since the dinosaurs were wiped out, here’s the history. We start with the whole 65 million years, then zoom in, and zoom in again to the last 12,000 from both ends of the world. What’s obvious is that in terms of homo sapiens history, things are warm now (because we’re not in an ice age). But, in terms of homo sapiens civilization, things are cooler than usual, and appear to be cooling.
By Viv Forbes
There are three big drivers of weather for any place on Earth: the latitude, the local environment, and solar system cycles.
The biggest weather factor is latitude – are you in the torrid, temperate, or frigid zone? These climatic zones are defined by the intensity of heat delivered to Earth’s surface by the sun.
In the Torrid Zone, the sun is always high in the sky. It is generally hot, often moist, with low atmospheric pressure, muggy conditions, and abundant rain and storms, some severe. Places close to the Equator get two summers per year (just one long summer) and very little winter. Farther from the equator, there are two seasons: “The Wet” and “The Dry.” The Torrid Zone produces many equatorial rainforests and also contains some deserts. Most people dream of vacations or retirement in the warm zone.
Continue reading “How Weather and Climate Work”