Carbon 14 dating is accurate by

datingsite elitedating forum

Time in this equation is measured in years from the moment when the plant dies ( ) and the amount of Carbon 14 remaining in the preserved plant is measured 

Carbon Dating Could Stop Working as Earth's Atmosphere Ages

NQ Accuracy of Carbon 14 Dating II - Illustrative Mathematics

Radiocarbon Dating - Science Meets Religion

Carbon 14: Contamination - Secular Web