SUMMARY
Problem of climate change at the present time
Nguyễn Đức T�m
More than 30 years ago (1977-1979), on the
basis of the discovery of a�
very large coastal erosion developed on� nearly the whole length of the sea shore of
Việt Nam, the author of this paper recognized that current sea level rise
is just caused by ice melting in the poles and high mountains, and considered
this phenomenon as an idication of a new cycle of climate change, but not an
ordinary fluctuation of sea level. The author has exchanged
this idea in papers and discussed with Vietnamese and international scientists.
A special notice of the author is that the current climate change is mainly due
to a climate cycle, possibly�
caused by the oscillation of the axis of the earth, which leads
to the changing of� relative position of
the sun and earth - the sun somewhat moved closer to the poles of the earth and
this change causes the warming in polar zones, and by this reason ice melts,
and a new deglaciation begins. This phenomenon may be the main reason of the
glacial-interglacial cycles in the past, as proposed by Serbian scientist
Melankovic [10]. On the other hand, the warming process may ignite the
abstraction of methane from the sea bottom to increase the volume of greenhouse
gases in the atmosphere. This phenomenon might begin 3-4 centuries ago and now
the speed is increasing. And this process can stop after� 3-4 centuries, and it will be a� new glacial cycle with the lowering of the
sea level and regression. Naturally, the world industry has thrown greenhouse
gasses into the atmosphere, but it might have� a very small contribution to the
global warming. Obviously, it is necessary to continue to study in order to
determine the exact main reason of climate change and global warming and to
find efficient and economic measures to cope with the situation.
Người bi�n tập: Nguyễn Th�nh Vạn