in a nutshell scientists some scientists have come to believe that carbon dioxide
which exists naturally in the world and which humans contribute to through their
industrial processes is responsible for heating the planet and so this whole
movement began as global warming but actually it didn't it actually began as
global cooling back in the 70s some scientists looked at the trend and
anticipated that back then mankind was approaching global cooling a new ice age
and a group of them sent a letter to the present at the time in the United States
has said we are in imminent danger of cooling we need to do something about it
now in reality that was a natural cycle and all of a sudden things started to
warm and almost in a seamless way the scientists then said oh well actually
the world is warming and we're responsible for it and we need to do
something about it so if you wind yourself back to the last decade of the
last century apart from there being a global warming spike which is a natural
thing which is an El Nino spike which was one of the largest that we've had
which you might say artificially raised temperatures above the normal apart from
that it seemed for that decade like the increase in carbon dioxide as measured
by the Mauna Loa observatory on Hawaii and world average temperatures were both
going up in tandem so scientists then latched on to this and said the one is
the cause of the other now in a way you could have gone either way you could
have said the temperature is leading or causing the increase in carbon dioxide
or you could do the opposite and say the increase in carbon dioxide is
causing the increase in the temperature well they chose the latter they claimed
that carbon dioxide was the one that was causing the temperature rise so what
they're saying is there is a causal relationship between rising levels of
carbon dioxide and rising temperatures the one is the cause of the other and
they have wanted everybody to adopt that view point and they pressed it very very
hard the only problem with that is that after that last decade temperatures
which had been going up all of a sudden would no longer following the carbon
dioxide but went wandering off all over the place and so world average
temperatures from around 1998 around about 2000 until today have shown no net
warming and in fact in one year around about 2007 all the supposed warming
caused by industrial processes in the 20th century evaporated just completely
well you know collapsed and so that was a time which the the scientists changed
the title of global warming to climate change and since then they've adopted
what some many normal people seems amazing which is that whether it was or
whether it cools whether it's wetter or drier whether it's windier or calmer
all of that is due to carbon dioxide now there's the controversy one group of
scientists supposedly a 97% consensus except that's not true say yes whatever
is happening to our climate is being caused by carbon dioxide and especially
human beings and lots of other scientists are saying well hold on a
minute let's examine that more carefully and see if that's true
and there's your controversy there's another thing about carbon dioxide it's
almost that it is characterized as a poison there's something evil and
horrible about it because it's making the earth warm not just war but risk
cooking getting hot and killing all of us but in reality it's not carbon
dioxide is one of these trace gases certainly it does have a warming effect
no question about that but it's a lot less than the scientists imagined in
their global warming models and it's not a poison it's a plant food and we all
know that without carbon dioxide then you know photosynthesis falls apart
the higher it is the better plants and trees grow and the proof of that is that
by using satellites they've actually observed a greening of the earth over
this period when carbon oxide has been going up