Which of the following is an example of a proxy indicator of climate change? a) The summer of 2016 was the hottest on record and direct measurements keep increasing. b) Warmer summers observed over the last decade due to more people being on the planet breathing out more carbon dioxi c) Isotopes found in minerals within ancient volcanic eruptions show a climate pattern shifting over time d) A chemical signatures from ancient marine biota or ice used to estimate temperatures for the past 800,000 years. e)Historical records that use instruments to measure temperature from the last few hundred years.
