I am intrigued by the nature of time. Chambers dictionary definition of time includes "... a quantity measured by angle through which earth turns on its axis". This would seem to suggest that the rate of a planet's rotation would change time. Or am I wrong again?

For a biology experiment i'm planning on finding out the affect of climate change on algae or marine plants. I'm unsure how heat will affect these two types of organisms.

Following the recent spell of cold weather, I noticed that there are still piles of dirty snow with sand or grit (but not salt) in them, but all the clean snow has melted.

In the coldest parts of the world the temperature can be below -78 degrees C. which is the temperature at which carbon dioxide freezes. Would it be practical to remove the carbon dioxide from the atmosphere, at low cost, in these cold places, and so have a means of limiting the level of carbon dioxide in the the earth's atmophere?

Being a student of physics, reversal of magnetic poles of Earth has been quite a topic of concerned for me. But I didn't know that it's now shifting so fast.

The thing which I wanna know is, would this, shifting of magnetic poles of Earth, result in sun rising and setting from the opposite directions, I mean, after that Sun will rise from West and will set in East. I'm not very sure but what I've studied so far from that I think YES it would. Can anyone explain this?

I recently read that during a change in earth's climate 70 per cent of the creatures became extinct.  If we can predict this can we predict how many species were alive, for example do we know at what point the most species lived on the earth?

Surely it is not now.

My wife and I recently decided we could not, in clear conscience, make a trip to London merely to attend a wedding.  We were both sure that the cost to the planet of such whimsical continent-hopping must be unsustainable, but had no real idea just much energy it takes to move one adult from Johannesburg to London by air (approx 9000kms or a quarter of the way around the world).  We'd love an answer expressed in everyday terms like say tumble-drier-hours, or 100W lightbulbs burning, etc.

Tim Greene Johannesburg

I remember reading a SF book in the 1960s which included a means of weather control. The theory given was that in an arid region, a length of tough flexible plastic tube was prepared. One end of the tube was anchored down, allowing a flow of air to enter the base, and then air was pumped into the end anchored. The tube was inflated and gradually stood up with the column of air extending the vertical tube. At a critical height the warmer air at the base of the column would begin to be sucked in to replace the cooler air rising to the top. The pump could be switched off and when fully extended at a predetermined height column of cooler air at the top would condense into clouds and result in rain. This would be self sustaining with the cool air being drawn in at the base and escaping at the top. The technology and materials were obviously not available when the book was published,  but is this still true today?

How much water, World wide, is in the atmosphere. If there were no rain clouds or humidity across the planet, how much deeper would the oceans be?