&gt;Not sure what you mean by &quot;Capping&quot;;<p>Regulatory limits on CO2 emissions - &quot;cap and trade&quot;.<p>&gt;my choice to ride a bike to work rather than drive comes at an energy savings not cost.<p>Most people in the US cannot ride their bike to work, and it&#x27;s not because they are overweight. About half the people commute &gt; 10 miles, which is not reasonable for a daily bike commute in &lt;40F weather, and even when it&#x27;s warmer that&#x27;s a miserable amount of time to be forced to commute every day. This also ignores people that need to pickup&#x2F;dropoff kids.<p>So people will not choose to give up driving because the alternatives suck. It would have to be forced. Otherwise they would be riding their bikes now.