Wry Catcher
Diamond Member
- Banned
- #121
The current rate of change is not uncommon (different from) and not faster than that of the past changes... Your premise fails basic empirical evidence review..You do realize the arctic has been ice free several times each inter-glacial cycle over the past 100 million years or so don't you? This is a natural cycle..
Back to thrashing the fake news called AGW.. Did the earths climate change over the 4.5 billion years or was it stagnate at today's levels?
Heres the problem with that concept. When climate changes over millions of years, life can adapt. For instance, Neanderthals were adapted to live in cold climates. When the climate changes too fast, then life doesn't adapt to live in it.
Q. If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now?
A. The first piece of evidence that the warming over the past few decades isn’t part of a natural cycle is how fast the change is happening. The biggest temperature swings our planet has experienced in the past million years are the ice ages. Based on a combination of paleoclimate data and models, scientists estimate that when ice ages have ended in the past, it has taken about 5,000 years for the planet to warm between 4 and 7 degrees Celsius. The warming of the past century—0.7 degrees Celsius—is roughly eight times faster than the ice-age-recovery warming on average.
The second reason that scientists think the current warming is not from natural influences is that, over the past century, scientists from all over the world have been collecting data on natural factors that influence climate—things like changes in the Sun’s brightness, major volcanic eruptions, and cycles such as El Niño and the Pacific Decadal Oscillation. These observations have failed to show any long-term changes that could fully account for the recent, rapid warming of Earth’s temperature.
Link: If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now? : Climate Q&A : Blogs