Evidence from the fossil record suggests that other climatic Evidence from the fossil record suggests that other climatic changes have occurred in the history of geologic time. Why is climate change today a subject of concern? 1 point
a) Global temperature is changing at a faster rate than climatic events in the fossil record
b) Plants are no longer able to photosynthesize so there is more carbon-dioxide in the air
c) Because there are more people on Earth today there is a shortage of oxygen to breathe
d) All of the above have occurred in the history of geologic time. Why is climate change today a subject of concern?​

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.