Changing weather patterns, anything new?

There is a lot of concern about changing weather patterns around the world. But if we look back into the history, not so long ago, there were severe weather changes too.

• During the El Nino cycle in 1789, 600,000 people died in just one region of India due to severe drought.
• The nineteenth century blizzard of 1888 paralysed East Coast from Cheasapeake Bay to Maine
  
• the "year of no summer" in 1816
• The eighteenth century brought tremendous cold and snow - the "little ice age"
• Thomas Jefferson wrote about a global warming during his time!
• Hurricanes in Havana in 1932 killed 3500 plus people
• The Great Blizzard of 1978 in Ohio lasted 2 days
• The El Nino in 1997 was the biggest and hottest in 150 years

Therefore weather changes are nothing new. But are we more, or less vulnerable to their effects today? We know how in the ancient past whole civilizations disappeared due to drought and other adverse weather conditions. Some survived by moving to different locations. Can we do the same? Do we have any safeguards, that they did not have? Do we have greater weaknesses today. that will give rise to greater disasters in human numbers than at those times?