- Posts: 14807
- Thank you received: 227
Ahh, but the more I can grow myself, the less in fossil fuels used to truck or fly vegetables to my grocery store that I must purchase. There's always a trade-off, and you have to look at the bigger picture of where more harm is being done - if every household had their own compost and had their own gardens, what size gardens would they need to offset enough purchases from the grocery store (which often gets produce from farms that use heavy nitrogen fertilizers, pesticides, and unhealthy land use) that the net addition of carbon to the atmosphere would be less?
Rick wrote: Ah yes, but composting still creates methane and C02 depending on how much oxygen it gets. So you really cant get away from killing the planet.
Not explicitly mentioned is that weather is very localized geographically. Weather forecasts are made for towns and cities; climate usually refers to regions, continents, and the planet as a whole - it's not just longer-term, but bigger in area as well.
The difference between weather and climate is a measure of time. Weather is what conditions of the atmosphere are over a short period of time, and climate is how the atmosphere "behaves" over relatively long periods of time.
When we talk about climate change, we talk about changes in long-term averages of daily weather.
If summers seem hotter lately, then the recent climate may have changed. In various parts of the world, some people have even noticed that springtime comes earlier now than it did 30 years ago. An earlier springtime is indicative of a possible change in the climate.
Weather is basically the way the atmosphere is behaving, mainly with respect to its effects upon life and human activities. The difference between weather and climate is that weather consists of the short-term (minutes to months) changes in the atmosphere. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure, as in high and low pressure.
In most places, weather can change from minute-to-minute, hour-to-hour, day-to-day, and season-to-season. Climate, however, is the average of weather over time and space. An easy way to remember the difference is that climate is what you expect, like a very hot summer, and weather is what you get, like a hot day with pop-up thunderstorms.
Levels exceeded 409 parts per million for the first time in recorded history this month
We are now witnessing the fastest growth rates of the entire record of CO2 measurements. This record-breaking growth is an expected consequence of the near record-breaking fossil fuel usage combined with the largest El Niño event in several decades.
The larger story remains that Earth hasn’t seen levels this high in at least several million years. Unless fossil fuel emissions soon drop significantly below current levels, I expect CO2 levels will surpass the 450 mark by around 2035 and the 500 mark around 2065.
Barring some major breakthrough that allows excess CO2 to be scrubbed from the air, it is currently an impossibility for us to reach the target of 350 ppm that many consider the threshold of dangerous climate change effects. I expect it will take at least 1,000 years before CO2 drops again below 350 ppm.
– Ralph Keeling, director of Scripps CO2 Group
The starting point was to look at the bulk – the average – heat radiation and the total energy flow. I searched the publications back in time, and found a paper on the greenhouse effect from 1931 by the American physicist Edward Olson Hulburt (1890-1982) that provided a nice description. The greenhouse effect involves more than just radiation. Convection also plays a crucial role.
How does the understanding from 1931 stand up in the modern times? I evaluated the old model with modern state-of-the-art data: reanalyses and satellite observations.