Power Point Presentation

This is a Power Point Presentation I built as part of a online Uni course I am doing with Coursera.

The course is called “Turn Down the Heat: Why a 4°C Warmer World Must be Avoided

This is a Presentation, I could  give to a local Transition Towns meeting, and I have given to a “Permaculture Design Course” Class.

 

Cover

It looks like we will pass 2 degrees centigrade, and are on the way to 4.

There has been some discussion in the blogasphere about humanity running out of time to take action to reduce our greenhouse gas emissions to keep the planet under the safe temperature of 2 degrees centigrade. In 2013 the world continued on the business as usual path, and greenhouse gas emissions continue to increase.

Slide 1

Slide1
With Slide one I would ask the Audience “How long do they think we have known about Climate Change?”

Ask for answers from the audience. Now I’ll give you a brief history.

Slide 2

With this slide I would talk about Guy Callendar

With this slide I would talk about Guy Callendar

I would also mention that the existence of the greenhouse effect was reasoned from experimental observations by John Tyndall in 1859, and more fully quantified by Svante Arrhenius in 1896.

Slide 3

Charles Keeling built a very accurate instrument to measure the concentration of CO2 in the atmosphere

Charles Keeling built a very accurate instrument to measure the concentration of CO2 in the atmosphere

Keeling started his observations in 1958 at the Mauna Loa Observatory in Hawaii, and they are still ongoing today. (but no longer being done by Keeling).

Slide 4

Slide4

This is the world famous Keeling Curve

Slide 5

Slide5

In 1965 President Lyndon Johnson made this statement to Congress.

Slide 6

A quote from the Charney report 1979

A quote from the Charney report 1979

Slide 7

The 1998 IPCC and James Hansen Testifies.

The 1998 IPCC and James Hansen Testifies.

Slide 8

What has Happened between 1979 and Now.

What has Happened between 1979 and Now.

Slide 9

Here are some examples of the reality of Climate Change.

Here are some examples of the reality of Climate Change.

Slide 10

Slide10

Storm example.

Slide 11

Flood example.

Flood example.

Slide 12

London Flood 2014 example

London Flood 2014 example

Slide 13

Heat example

Heat example

Slide 14

Australian Head record

Australian Heat record

Slide 15

USA Cold example

USA Cold example

Slide 16

Slide16

Now, Remember the Keeling Curve

Slide 17

In April 2013 the level of CO2 in the Atmosphere goes over the 400ppm level for the 1st time.

In April 2013 the level of CO2 in the Atmosphere goes over the 400ppm level for the 1st time.

Slide 18

This graph shows the level of CO2 in the past which has rarely reached 300ppm.

This graph shows the level of CO2 in the past which has rarely reached 300ppm.

Slide 19

Some of the potential tipping points across the globe.

Some of the potential tipping points across the globe.

There are a number of potential tipping points, none of which is fully understood.
We will only know we have crossed a tipping point with hindsight.

Slide 20

An example of a potential Tipping Point, the release of Methane gas from the Arctic.

An example of a potential Tipping Point, the release of Methane gas from the Arctic.

Slide 21

Graph of the rise of CH4 Meathean

Graph of the rise of CH4 Methane

(Note: this graph is in parts per billion (ppb) not part per million (ppm). If you want to compare this graph to a graph of CO2 be careful to get the units right.)

Slide 22

Are we going to stay below 2 degrees or is 4 the new 2.

Are we going to stay below 2 degrees or is 4 the new 2.

We need to take action on climate change now. We have know about it for a long time, the changing weather tells us it is real, and we are in danger of going past a tipping point unknowingly which we will be unable to return from.

Slide 23

Quote

Quote

Sources Slide

Sources

Sources

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