What's needed, alongside an evacuation plan, is a realistic program to stabilize conditions for those left behind.
( ( What ( 's ( ( ( needed , ) ( alongside ( an ( evacuation plan ) ) ) ) , ) ) ) ( ( is ( a ( realistic ( program ( to ( ( stabilize conditions ) ( for ( those ( left behind ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (SBAR (WHNP (WP What)) (S (VP (VBZ 's) (VP (VBN needed) (, ,) (PP (IN alongside) (NP (DT an) (NN evacuation) (NN plan))) (, ,))))) (VP (VBZ is) (NP (DT a) (JJ realistic) (NN program) (S (VP (TO to) (VP (VB stabilize) (NP (NNS conditions)) (PP (IN for) (NP (NP (DT those)) (VP (VBN left) (PRT (RP behind)))))))))) (. .)))
Evacuation is always the first line of response. 
( Evacuation ( ( ( is always ) ( ( the ( first line ) ) ( of response ) ) ) . ) )
(ROOT (S (NP (NNP Evacuation)) (VP (VBZ is) (ADVP (RB always)) (NP (NP (DT the) (JJ first) (NN line)) (PP (IN of) (NP (NN response))))) (. .)))