Overdose: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: unusual excitement, fast/irregular heartbeat, seizures.
Natural Variation Natural variation includes internal and external variability influences such as the solar Schwabe cycle, oceanic cycles, seasonal influences based on changes caused by the interaction of the various natural oscillations in the climate system.
Natural Variability of the Climate. Natural climate variability, as the name suggests, is caused by natural factors. There are lots of natural factors that cause significant changes in the climate. These causes can be within the earth or coming from outside the earth. Based on this, the natural climate variability can be categorized into two groups.