Presentation on theme: "Steve Dutch University of Wisconsin-Green Bay"— Presentation transcript:
1 Steve Dutch University of Wisconsin-Green Bay Future EarthSteve DutchUniversity of Wisconsin-Green Bay
2 Why Look Ahead? Usually picture geologic time by looking back New PerspectiveCan you picture the U.S. in 1000 years?That’s an instant in geologic timeHuman activities are ephemeral compared to geologic time
3 1000 Years 5-7 M=8 quakes on San Andreas New Madrid and Cascadia quakes10 Cascades eruptionsMississippi delta shiftNiagara Falls retreats 900 metersHawaii moves 90 metersProbable damaging meteor impactOne or more supernovas
4 Humans in 1000 yearsProbably many cities and nations will still be extant
5 10,000 years 50-70 M=8 quakes on San Andreas 100 Cascades eruptions 10-20 Mississippi delta shiftsNiagara Falls retreats 9 kilometersHawaii moves 900 metersProbable meteor impact with regional effectsHudson’s Bay and Baltic drainedDozens of SupernovasEarth axis tilt 22-1/2 degrees
8 Humans in 10,000 yearsIn 8,000 years we got from proto-Indo-European to English, Latin and RussianTime enough for new languages to evolveWill any word in any language still survive?
9 100,000 years San Andreas shifted by 2.5 kilometers 1000 Cascades eruptionsMississippi delta shiftsNiagara Falls retreated to Lake ErieLoihi reaches surface?Numerous meteor impacts with regional effects probableNext ice age?New stars may form
12 Humans in 100,000 yearsTime enough to develop our civilization from Paleolithic technologyFewer natural resources but…Old human deposits may be better sources than rocks
13 1,000,000 years San Andreas shifted by 25 kilometers Large new Cascades volcanoesMississippi delta shiftsTen ice ages?Loihi and Kilauea as large as present Mauna LoaSeveral collapses of Hawaiian shieldsSeveral supervolcano eruptionsMeteor impact with global effects probable
16 Humans in 1,000,000 years Human race itself may evolve If society collapses long enough, different gene pools may speciate
17 What Will Endure 1,000,000 years? Steel corrodes Titanic and Arizona will be gone in 1000 years.Most likely to survive: no steel, solidHighway and canal cutsEarth fill damsOpen pit mines and mine dumpsLarge monuments (Mount Rushmore, Pyramids)
18 What Will They See of Us? Pleistocene mass extinction Rapid global spread of human artifacts, reduction of forests, and spread of domestic animalsSixth Extinction?Many endangered organisms would never show up in fossil recordCaution in comparing present extinctions with pastOur choice
20 Long-Term Climatic Trends Brightening of the SunCapturing of CO2 by carbonate rocks?Moist greenhouse effectRunaway CO2 Greenhouse EffectVenus conditions
21 Planetary Habitable Zones Primarily in the Liquid Water ZoneCan’t be too warmWater Vapor in upper atmosphere broken down by solar UV and charged particles (photodissociation)Hydrogen escapes to space
Your consent to our cookies if you continue to use this website.