Source: "Climate Change – Isn't it natural?" YouTube video by potholer54 (Peter Hadfield, retired British journalist)
Extended quote: by Peter Hadfield:
"Yes, the climate has changed before. It always has and it always will. That is what's called an observation, just as we can observe lightning, shooting stars, and earthquakes. They are all natural. But, the role of a scientist is not just to sit back and marvel at all these natural mysteries. It is to find out why they happen. So what climatologists want to know is what causes the climate to change.
And now after two centuries of research, they have a pretty good idea..."
Notes: Hadfield then lists four main factors that cause the Earth's climate to change:
1. Insolation (intensity and amount of radiation of sunlight on the Earth or part of the earth)
- Energy output from the sun
- Orientation of the earth
- Earth's orbit
2. Greenhouse gases
(Carbon Dioxide, Methane, water vapor, etc)
3. Particulates and aerosols (they block sunlight and cool the earth down)
- industrial pollution
4. Amplifcation (Earth itself can amplify these changes increasing or decreasing feedbacks or even the configeration of the continents).
Hadfield then point out that the problem is that scientific journals, while very accessible and available online, "do not get passed around and re-pasted on internet blogs. They requre a great deal of effort (to read and understand).
I supposed it is quicker and easier to read a blog by a mining engineer and come away feeling like you are an instant expert. It's kind of the 'fast food approach to science.'"
Bottom line: "It is a number of factors that drives our climate" according to Peter Hadfield.
Image Source: www.telegraph.co.uk