when people travel,they make pollution and use lots of energy.But you should try to use as little e___ as you can .here

when people travel,they make pollution and use lots of energy.But you should try to use as little e___ as you can .here is an e___.
A couple have travelled a___the world in 297 days--without taking any p___.tom fewins and lara Lockwood used 78 buses ,61trains,34cars,18boats,six bicycles,and e___ one elephant.Theywanted to show that tourists can still e___ travelling without damaging the environment.they said they produced much l___ carbon dioxide than usual.
they s___ ten months travelling 44,609 miles t___ 18 countries,The couple's world tour began in june 2008 with a two--hour bus journey to london.And they r___home ten months later,in May 2009.
the couple hoped to write a book to teach other travelers how to travel without damaging the environment