“Thus, human beings are now carrying out a large scale geophysical experiment of the kind that could not have happened in the past...Within a few centuries we are returning to the atmosphere and oceans the concentrated organic carbon stored in sedimentary rocks over hundreds of millions of years.” YearsHumansKindPastEnergyHuman BeingsMillionsEnvironmentHappenedRocksCenturyOceanClimate ChangeScalesExperimentsAtmosphereCarbonLarge Scale Author:Roger Revelle
“We can learn from history how past generations thought and acted, how they responded to the demands of their time and how they solved their problems. We can learn by analogy, not by example, for our circumstances will always be different than theirs were. The main thing history can teach us is that human actions have consequences and that certain choices, once made, cannot be undone. They foreclose the possibility of making other choices and thus they determine future events.” HumansMadeDifferentProblemActionPastCertainChoicesKnowledgeTeachGenerationsEventsExamplePossibilityCircumstancesDemandConsequenceClimate ChangeDetermineUndoneAnalogiesHuman ActionsFuture EventsPast GenerationsActions Have Consequences Book:Why History Matters: Life and Thought Source: Why History Matters: Life and Thought