Which of the following is the appropriate word for the blank (x)?

Directions: In the following passage there are blanks, each of which has been numbered. These numbers are printed below the passage and against each, five words are suggested, one of which, fits the blank appropriately.

The warning against carbon emissions, which is __(i)__ the earth, just got more urgent. The UN human development report said on Tuesday that __(ii)__ the global community agreed to ­­__(iii)__ emissions by half by 2050, the world would face huge economic setbacks and also ecological __(iv)__. “We are on the __(v)__ of seeing human development __(vi)__ for the first time in 30 years, “Kevin Watkins, the author of the report was __(vii)__ as saying. The report said the poor nations would be hit the __(viii)__ as they are the least __(ix)__ to face nature’s __(x)__ manifest in devastating storms and droughts.