BartSimpson BartSimpson:
Sagan's use of the word 'catastrophic' is purely emotional. So is your use of it.
Sagan's use of it is dictionary perfect. Your interpretation of it is flawed.
$1:
adjective: catastrophic
1. involving or causing sudden great damage or suffering.
"a catastrophic earthquake"
involving a sudden and large-scale alteration in the state of something.
"the body undergoes catastrophic collapse toward the state of a black hole"
relating to geological catastrophism.
2.
extremely unfortunate or unsuccessful.
"catastrophic mismanagement of the economy"
synonyms: disastrous, calamitous, cataclysmic, apocalyptic, ruinous, tragic, fatal, dire, awful, terrible, dreadful
BartSimpson BartSimpson:
As to the warming on Venus it was a 100% natural process and despite the claims that the warming was recent the fact remains, as you said, that we know very little about the planet. Therefore any claim that the climate on Venus is a recent phenomenon is purely speculative.
No one said it wan't natural, and no one said it was recent.
Distractions is over now. Present evidence that the Warming Earth is experiencing is neither man influenced, nor dangerous, or whatever your interpretation is.
Be sure to show your work.