eg are you denying that the arctic ice has declined 30% since the 70's
and exactly how many peer-reviewed science journals have articles discrediting global warming..
(Petr)

Sorry, it is a serious theme but these two lines one under the other made me laugh out loud. If you take the time scale of your first line to answer the question of your second line the obvious answer is 'all of them' (at least if they have existed in the 70s). But one may guess that you had a completely different time window in mind when formulating the second line. Now to the first line.

A U.S. study concluded that minimum ice extent in the northern autumn has declined by 3.6 percent per decade since 1961.[2] The Nansen Environmental and Remote Sensing Centre in Norway found a 4.6 percent decline in ice extent and a 5.8 percent decline in actual ice area between 1978 and 1994.[3] Tentative results suggest that this decline accelerated betwen 1987 and 1994.

from a Greenpeace site

Even with a Greenpeace data base I don't come to 30%, Petr. Where do the 30% come from? Is it mass, extent, averag thickness or some other measure? Is it since the 70s or since the late 70s (you have used both expressions).

Hyperbole is not helpful in these discussions.

Wolfgang