EMIS­SIONS

Popular Mechanics (South Africa) - - HOW YOUR WORLD WORKS -

Our Pep­sico ve­hi­cle fleet is cur­rently com­prised of sev­eral dif­fer­ent fu­el­ef­fi­cient mod­els, in­clud­ing elec­tric-ve­hi­cle box trucks, com­pressed-nat­u­ral-gas trac­tors, and ad­vanced diesel tech­nol­ogy from some of the lead­ing man­u­fac­tur­ers around the world. The Tesla Semi truck rep­re­sents one part of our broader strat­egy, of­fer­ing us a unique op­por­tu­nity for us to ex­plore elec­tri­fi­ca­tion across our Class Seven and Eight fleet.” – BROOKE VANE Com­pany rep­re­sen­ta­tive, Pep­sico

Sunny-day floods – surges caused by high tides, not heavy rains – are 10 times more fre­quent to­day than 50 years ago. Wil­liam Sweet, an oceanog­ra­pher at NOAA, ex­plains what they are, and why they’re get­ting worse.

Pop­u­lar Me­chan­ics: Where are sunny-day floods hap­pen­ing? Wil­liam Sweet: It’s more low-ly­ing East Coast and Gulf Coast cities like Hous­ton, At­lantic City, Mi­ami. It’ll be sunny out but sud­denly streets are un­der wa­ter. It doesn’t help that the land is sink­ing there, while sea level is ris­ing. PM: But sea-level rise is the main fac­tor? WS: Yes, it in­creases the reach of high tides. Melt from ice sheets and glaciers – plus ther­mal ex­pan­sion – put the cur­rent global sea-level rise at 2,5 cen­time­tres every eight years. But grav­ity is also work­ing against us: as Antarc­tica loses mass, its grav­i­ta­tional at­trac­tion is less. This re­dis­tri­bu­tion means the US feels an ad­di­tional rise. PM: How are cities pre­par­ing? WS: They’re in­vest­ing in pumps and in­flow­pre­ven­ter storm drains. It’s anal­o­gous to snow in the north­east: cities just have to budget for it.

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