ItB次元官网网址檚 disappointing to have to, yet again, write a letter to address false claims about human caused climate change (Ken Lane, ).

First, the carbon dioxide added to the Earth system by human activities is indeed small in comparison to the amount of CO2 that moves naturally between atmosphere, ocean, and land. However, the added carbon tips the natural balance, and is the dominant cause of the change that has been observed in the EarthB次元官网网址檚 climate, in sea-ice area, in sea level, in ocean acidification, and in many other systems.

Second, the effect of B次元官网网址減lanetary, lunar, solar, and celestialB次元官网网址� processes on climate change are inconsequential in comparison to the scale of present human activities. For example, we currently emit more than 24 times the CO2 (equivalent) emitted by volcanoes and natural geological processes on an annual average.

Natural processes mentioned in LaneB次元官网网址檚 letter do not explain the observations. Humans are the cause of observed climate and related changes. Human activities include carbon added to the atmosphere, as CO2 and methane (natural gas) from fossil-sourced fuels, CO2 from the production of cement, land-use change, and more. This is accepted by scientists and lay-people everywhere. ItB次元官网网址檚 the position of every national science organization on Earth. ItB次元官网网址檚 a fact.

For references and more information start with the IPCC summary documents. Or, use resources from the many credible government, national, and university-based organizations around the world. Send me an email (ecwiebe@uvic.ca), I can point you in the right direction.

ItB次元官网网址檚 time to stop the pretend debate and to take seriously the need to act to reduce future harm.

Ed Wiebe

Saanich